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然后呢？\n}\n",[935,1045,1046,1056,1066,1076,1088,1102,1114,1119],{"__ignoreMap":945},[949,1047,1048,1050,1052,1054],{"class":951,"line":952},[949,1049,956],{"class":955},[949,1051,960],{"class":959},[949,1053,964],{"class":963},[949,1055,967],{"class":959},[949,1057,1058,1060,1062,1064],{"class":951,"line":970},[949,1059,974],{"class":973},[949,1061,978],{"class":977},[949,1063,982],{"class":981},[949,1065,985],{"class":959},[949,1067,1068,1070,1072,1074],{"class":951,"line":988},[949,1069,991],{"class":977},[949,1071,995],{"class":994},[949,1073,998],{"class":959},[949,1075,1001],{"class":959},[949,1077,1078,1080,1082,1084,1086],{"class":951,"line":1004},[949,1079,1007],{"class":977},[949,1081,1011],{"class":1010},[949,1083,1014],{"class":959},[949,1085,1017],{"class":973},[949,1087,1020],{"class":959},[949,1089,1090,1092,1095,1097,1100],{"class":951,"line":1023},[949,1091,1007],{"class":977},[949,1093,1094],{"class":1010}," x",[949,1096,1014],{"class":959},[949,1098,1099],{"class":973},"0",[949,1101,1020],{"class":959},[949,1103,1104,1107,1110,1112],{"class":951,"line":1030},[949,1105,1106],{"class":1010},"    cin ",[949,1108,1109],{"class":959},">>",[949,1111,1094],{"class":1010},[949,1113,985],{"class":959},[949,1115,1117],{"class":951,"line":1116},7,[949,1118,1027],{"class":1026},[949,1120,1122],{"class":951,"line":1121},8,[949,1123,1033],{"class":959},[922,1125,1126],{},"需要判断 x 是大了还是小了，因此需要写一些分支……这里的代码多了起来，请稍微回想一下我们在分支一节学的内容，应该不难理解。",[940,1128,1130],{"className":942,"code":1129,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int ans{42};\n    int x{0};\n    cin >> x;\n    if (x > ans) {\n        \u002F\u002F 这里放猜大了应该做的事\n    }\n    if (x \u003C ans) {\n        \u002F\u002F 这里放猜小了应该做的事\n    }\n    \u002F\u002F ... 然后呢？\n}\n",[935,1131,1132,1142,1152,1162,1174,1186,1196,1217,1222,1228,1246,1252,1257,1262],{"__ignoreMap":945},[949,1133,1134,1136,1138,1140],{"class":951,"line":952},[949,1135,956],{"class":955},[949,1137,960],{"class":959},[949,1139,964],{"class":963},[949,1141,967],{"class":959},[949,1143,1144,1146,1148,1150],{"class":951,"line":970},[949,1145,974],{"class":973},[949,1147,978],{"class":977},[949,1149,982],{"class":981},[949,1151,985],{"class":959},[949,1153,1154,1156,1158,1160],{"class":951,"line":988},[949,1155,991],{"class":977},[949,1157,995],{"class":994},[949,1159,998],{"class":959},[949,1161,1001],{"class":959},[949,1163,1164,1166,1168,1170,1172],{"class":951,"line":1004},[949,1165,1007],{"class":977},[949,1167,1011],{"class":1010},[949,1169,1014],{"class":959},[949,1171,1017],{"class":973},[949,1173,1020],{"class":959},[949,1175,1176,1178,1180,1182,1184],{"class":951,"line":1023},[949,1177,1007],{"class":977},[949,1179,1094],{"class":1010},[949,1181,1014],{"class":959},[949,1183,1099],{"class":973},[949,1185,1020],{"class":959},[949,1187,1188,1190,1192,1194],{"class":951,"line":1030},[949,1189,1106],{"class":1010},[949,1191,1109],{"class":959},[949,1193,1094],{"class":1010},[949,1195,985],{"class":959},[949,1197,1198,1201,1204,1207,1210,1212,1215],{"class":951,"line":1116},[949,1199,1200],{"class":955},"    if",[949,1202,1203],{"class":959}," (",[949,1205,1206],{"class":1010},"x ",[949,1208,1209],{"class":959},">",[949,1211,1011],{"class":1010},[949,1213,1214],{"class":959},")",[949,1216,1001],{"class":959},[949,1218,1219],{"class":951,"line":1121},[949,1220,1221],{"class":1026},"        \u002F\u002F 这里放猜大了应该做的事\n",[949,1223,1225],{"class":951,"line":1224},9,[949,1226,1227],{"class":959},"    }\n",[949,1229,1231,1233,1235,1237,1240,1242,1244],{"class":951,"line":1230},10,[949,1232,1200],{"class":955},[949,1234,1203],{"class":959},[949,1236,1206],{"class":1010},[949,1238,1239],{"class":959},"\u003C",[949,1241,1011],{"class":1010},[949,1243,1214],{"class":959},[949,1245,1001],{"class":959},[949,1247,1249],{"class":951,"line":1248},11,[949,1250,1251],{"class":1026},"        \u002F\u002F 这里放猜小了应该做的事\n",[949,1253,1255],{"class":951,"line":1254},12,[949,1256,1227],{"class":959},[949,1258,1260],{"class":951,"line":1259},13,[949,1261,1027],{"class":1026},[949,1263,1265],{"class":951,"line":1264},14,[949,1266,1033],{"class":959},[922,1268,1269],{},"注意到每次判断的时候，需要输出一个提示信息，于是我们这样写。",[940,1271,1273],{"className":942,"code":1272,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int ans{42};\n    int x{0};\n    cin >> x;\n    if (x > ans) {\n        cout \u003C\u003C \"That's bigger than the answer. Try again?\" \u003C\u003C endl;\n    }\n    if (x \u003C ans) {\n        cout \u003C\u003C \"That's smaller than the answer. Try again?\" \u003C\u003C endl;\n    }\n    \u002F\u002F ... 然后呢？\n}\n",[935,1274,1275,1285,1295,1305,1317,1329,1339,1355,1381,1385,1401,1420,1424,1428],{"__ignoreMap":945},[949,1276,1277,1279,1281,1283],{"class":951,"line":952},[949,1278,956],{"class":955},[949,1280,960],{"class":959},[949,1282,964],{"class":963},[949,1284,967],{"class":959},[949,1286,1287,1289,1291,1293],{"class":951,"line":970},[949,1288,974],{"class":973},[949,1290,978],{"class":977},[949,1292,982],{"class":981},[949,1294,985],{"class":959},[949,1296,1297,1299,1301,1303],{"class":951,"line":988},[949,1298,991],{"class":977},[949,1300,995],{"class":994},[949,1302,998],{"class":959},[949,1304,1001],{"class":959},[949,1306,1307,1309,1311,1313,1315],{"class":951,"line":1004},[949,1308,1007],{"class":977},[949,1310,1011],{"class":1010},[949,1312,1014],{"class":959},[949,1314,1017],{"class":973},[949,1316,1020],{"class":959},[949,1318,1319,1321,1323,1325,1327],{"class":951,"line":1023},[949,1320,1007],{"class":977},[949,1322,1094],{"class":1010},[949,1324,1014],{"class":959},[949,1326,1099],{"class":973},[949,1328,1020],{"class":959},[949,1330,1331,1333,1335,1337],{"class":951,"line":1030},[949,1332,1106],{"class":1010},[949,1334,1109],{"class":959},[949,1336,1094],{"class":1010},[949,1338,985],{"class":959},[949,1340,1341,1343,1345,1347,1349,1351,1353],{"class":951,"line":1116},[949,1342,1200],{"class":955},[949,1344,1203],{"class":959},[949,1346,1206],{"class":1010},[949,1348,1209],{"class":959},[949,1350,1011],{"class":1010},[949,1352,1214],{"class":959},[949,1354,1001],{"class":959},[949,1356,1357,1361,1364,1367,1370,1373,1376,1379],{"class":951,"line":1121},[949,1358,1360],{"class":1359},"swJcz","        cout ",[949,1362,1363],{"class":959},"\u003C\u003C",[949,1365,1366],{"class":959}," \"",[949,1368,1369],{"class":963},"That's bigger than the answer. Try again?",[949,1371,1372],{"class":959},"\"",[949,1374,1375],{"class":959}," \u003C\u003C",[949,1377,1378],{"class":1359}," endl",[949,1380,985],{"class":959},[949,1382,1383],{"class":951,"line":1224},[949,1384,1227],{"class":959},[949,1386,1387,1389,1391,1393,1395,1397,1399],{"class":951,"line":1230},[949,1388,1200],{"class":955},[949,1390,1203],{"class":959},[949,1392,1206],{"class":1010},[949,1394,1239],{"class":959},[949,1396,1011],{"class":1010},[949,1398,1214],{"class":959},[949,1400,1001],{"class":959},[949,1402,1403,1405,1407,1409,1412,1414,1416,1418],{"class":951,"line":1248},[949,1404,1360],{"class":1359},[949,1406,1363],{"class":959},[949,1408,1366],{"class":959},[949,1410,1411],{"class":963},"That's smaller than the answer. Try again?",[949,1413,1372],{"class":959},[949,1415,1375],{"class":959},[949,1417,1378],{"class":1359},[949,1419,985],{"class":959},[949,1421,1422],{"class":951,"line":1254},[949,1423,1227],{"class":959},[949,1425,1426],{"class":951,"line":1259},[949,1427,1027],{"class":1026},[949,1429,1430],{"class":951,"line":1264},[949,1431,1033],{"class":959},[922,1433,1434,1435,1437,1438,1440,1441,1443,1444,1446],{},"接下来问题来了。如果仅仅如此的话，那么输入一次就结束了，没法让用户多次尝试，不符合我们的预期。那么该如何做呢？聪明的你一定想到了：使用循环。那么在使用前仔细考虑一下循环的条件——没错，当输入的数和答案不相等的时候才会重复执行。另外，每次重复执行前需要再次请求用户输入。因此我们加上这样一个循环。解释一下：当第 6 行输入 ",[935,1436,1039],{}," 结束之后，检查 ",[935,1439,1039],{}," 是否是正确答案。如果不是正确答案，那么就需要进入循环，根据不同大小输出错误提示；随后允许用户继续尝试不同 ",[935,1442,1039],{}," 的输入。（也就是第 14 行的那个输入。）这个输入结束后，回过头来继续检查 ",[935,1445,1039],{}," 是否正确，周而复始下去。",[940,1448,1450],{"className":942,"code":1449,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int ans{42};\n    int x{0};\n    cin >> x;\n    while (x != ans) {\n        if (x > ans) {\n            cout \u003C\u003C \"That's bigger than the answer. Try again?\" \u003C\u003C endl;\n        }\n        if (x \u003C ans) {\n            cout \u003C\u003C \"That's smaller than the answer. Try again?\" \u003C\u003C endl;\n        }\n        cin >> x;\n    }\n}\n",[935,1451,1452,1462,1472,1482,1494,1506,1516,1534,1551,1570,1575,1591,1609,1613,1624,1629],{"__ignoreMap":945},[949,1453,1454,1456,1458,1460],{"class":951,"line":952},[949,1455,956],{"class":955},[949,1457,960],{"class":959},[949,1459,964],{"class":963},[949,1461,967],{"class":959},[949,1463,1464,1466,1468,1470],{"class":951,"line":970},[949,1465,974],{"class":973},[949,1467,978],{"class":977},[949,1469,982],{"class":981},[949,1471,985],{"class":959},[949,1473,1474,1476,1478,1480],{"class":951,"line":988},[949,1475,991],{"class":977},[949,1477,995],{"class":994},[949,1479,998],{"class":959},[949,1481,1001],{"class":959},[949,1483,1484,1486,1488,1490,1492],{"class":951,"line":1004},[949,1485,1007],{"class":977},[949,1487,1011],{"class":1010},[949,1489,1014],{"class":959},[949,1491,1017],{"class":973},[949,1493,1020],{"class":959},[949,1495,1496,1498,1500,1502,1504],{"class":951,"line":1023},[949,1497,1007],{"class":977},[949,1499,1094],{"class":1010},[949,1501,1014],{"class":959},[949,1503,1099],{"class":973},[949,1505,1020],{"class":959},[949,1507,1508,1510,1512,1514],{"class":951,"line":1030},[949,1509,1106],{"class":1010},[949,1511,1109],{"class":959},[949,1513,1094],{"class":1010},[949,1515,985],{"class":959},[949,1517,1518,1521,1523,1525,1528,1530,1532],{"class":951,"line":1116},[949,1519,1520],{"class":955},"    while",[949,1522,1203],{"class":959},[949,1524,1206],{"class":1010},[949,1526,1527],{"class":959},"!=",[949,1529,1011],{"class":1010},[949,1531,1214],{"class":959},[949,1533,1001],{"class":959},[949,1535,1536,1539,1541,1543,1545,1547,1549],{"class":951,"line":1121},[949,1537,1538],{"class":955},"        if",[949,1540,1203],{"class":959},[949,1542,1206],{"class":1359},[949,1544,1209],{"class":959},[949,1546,1011],{"class":1359},[949,1548,1214],{"class":959},[949,1550,1001],{"class":959},[949,1552,1553,1556,1558,1560,1562,1564,1566,1568],{"class":951,"line":1224},[949,1554,1555],{"class":1359},"            cout ",[949,1557,1363],{"class":959},[949,1559,1366],{"class":959},[949,1561,1369],{"class":963},[949,1563,1372],{"class":959},[949,1565,1375],{"class":959},[949,1567,1378],{"class":1359},[949,1569,985],{"class":959},[949,1571,1572],{"class":951,"line":1230},[949,1573,1574],{"class":959},"        }\n",[949,1576,1577,1579,1581,1583,1585,1587,1589],{"class":951,"line":1248},[949,1578,1538],{"class":955},[949,1580,1203],{"class":959},[949,1582,1206],{"class":1359},[949,1584,1239],{"class":959},[949,1586,1011],{"class":1359},[949,1588,1214],{"class":959},[949,1590,1001],{"class":959},[949,1592,1593,1595,1597,1599,1601,1603,1605,1607],{"class":951,"line":1254},[949,1594,1555],{"class":1359},[949,1596,1363],{"class":959},[949,1598,1366],{"class":959},[949,1600,1411],{"class":963},[949,1602,1372],{"class":959},[949,1604,1375],{"class":959},[949,1606,1378],{"class":1359},[949,1608,985],{"class":959},[949,1610,1611],{"class":951,"line":1259},[949,1612,1574],{"class":959},[949,1614,1615,1618,1620,1622],{"class":951,"line":1264},[949,1616,1617],{"class":1359},"        cin ",[949,1619,1109],{"class":959},[949,1621,1094],{"class":1359},[949,1623,985],{"class":959},[949,1625,1627],{"class":951,"line":1626},15,[949,1628,1227],{"class":959},[949,1630,1632],{"class":951,"line":1631},16,[949,1633,1033],{"class":959},[922,1635,1636],{},"几乎完成了，就差最后一点：加上得到正确答案的提示就 OK 了。注意到当用户输入正确答案的时候会退出循环，于是在循环结束的地方加上这个输出提示就好。",[940,1638,1640],{"className":942,"code":1639,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int ans{42};\n    int x{0};\n    cin >> x;\n    while (x != ans) {\n        if (x > ans) {\n            cout \u003C\u003C \"That's bigger than the answer. Try again?\" \u003C\u003C endl;\n        }\n        if (x \u003C ans) {\n            cout \u003C\u003C \"That's smaller than the answer. Try again?\" \u003C\u003C endl;\n        }\n        cin >> x;\n    }\n    cout \u003C\u003C \"Bingo! You got the answer!\" \u003C\u003C endl;\n}\n",[935,1641,1642,1652,1662,1672,1684,1696,1706,1722,1738,1756,1760,1776,1794,1798,1808,1812,1832],{"__ignoreMap":945},[949,1643,1644,1646,1648,1650],{"class":951,"line":952},[949,1645,956],{"class":955},[949,1647,960],{"class":959},[949,1649,964],{"class":963},[949,1651,967],{"class":959},[949,1653,1654,1656,1658,1660],{"class":951,"line":970},[949,1655,974],{"class":973},[949,1657,978],{"class":977},[949,1659,982],{"class":981},[949,1661,985],{"class":959},[949,1663,1664,1666,1668,1670],{"class":951,"line":988},[949,1665,991],{"class":977},[949,1667,995],{"class":994},[949,1669,998],{"class":959},[949,1671,1001],{"class":959},[949,1673,1674,1676,1678,1680,1682],{"class":951,"line":1004},[949,1675,1007],{"class":977},[949,1677,1011],{"class":1010},[949,1679,1014],{"class":959},[949,1681,1017],{"class":973},[949,1683,1020],{"class":959},[949,1685,1686,1688,1690,1692,1694],{"class":951,"line":1023},[949,1687,1007],{"class":977},[949,1689,1094],{"class":1010},[949,1691,1014],{"class":959},[949,1693,1099],{"class":973},[949,1695,1020],{"class":959},[949,1697,1698,1700,1702,1704],{"class":951,"line":1030},[949,1699,1106],{"class":1010},[949,1701,1109],{"class":959},[949,1703,1094],{"class":1010},[949,1705,985],{"class":959},[949,1707,1708,1710,1712,1714,1716,1718,1720],{"class":951,"line":1116},[949,1709,1520],{"class":955},[949,1711,1203],{"class":959},[949,1713,1206],{"class":1010},[949,1715,1527],{"class":959},[949,1717,1011],{"class":1010},[949,1719,1214],{"class":959},[949,1721,1001],{"class":959},[949,1723,1724,1726,1728,1730,1732,1734,1736],{"class":951,"line":1121},[949,1725,1538],{"class":955},[949,1727,1203],{"class":959},[949,1729,1206],{"class":1359},[949,1731,1209],{"class":959},[949,1733,1011],{"class":1359},[949,1735,1214],{"class":959},[949,1737,1001],{"class":959},[949,1739,1740,1742,1744,1746,1748,1750,1752,1754],{"class":951,"line":1224},[949,1741,1555],{"class":1359},[949,1743,1363],{"class":959},[949,1745,1366],{"class":959},[949,1747,1369],{"class":963},[949,1749,1372],{"class":959},[949,1751,1375],{"class":959},[949,1753,1378],{"class":1359},[949,1755,985],{"class":959},[949,1757,1758],{"class":951,"line":1230},[949,1759,1574],{"class":959},[949,1761,1762,1764,1766,1768,1770,1772,1774],{"class":951,"line":1248},[949,1763,1538],{"class":955},[949,1765,1203],{"class":959},[949,1767,1206],{"class":1359},[949,1769,1239],{"class":959},[949,1771,1011],{"class":1359},[949,1773,1214],{"class":959},[949,1775,1001],{"class":959},[949,1777,1778,1780,1782,1784,1786,1788,1790,1792],{"class":951,"line":1254},[949,1779,1555],{"class":1359},[949,1781,1363],{"class":959},[949,1783,1366],{"class":959},[949,1785,1411],{"class":963},[949,1787,1372],{"class":959},[949,1789,1375],{"class":959},[949,1791,1378],{"class":1359},[949,1793,985],{"class":959},[949,1795,1796],{"class":951,"line":1259},[949,1797,1574],{"class":959},[949,1799,1800,1802,1804,1806],{"class":951,"line":1264},[949,1801,1617],{"class":1359},[949,1803,1109],{"class":959},[949,1805,1094],{"class":1359},[949,1807,985],{"class":959},[949,1809,1810],{"class":951,"line":1626},[949,1811,1227],{"class":959},[949,1813,1814,1817,1819,1821,1824,1826,1828,1830],{"class":951,"line":1631},[949,1815,1816],{"class":1010},"    cout ",[949,1818,1363],{"class":959},[949,1820,1366],{"class":959},[949,1822,1823],{"class":963},"Bingo! You got the answer!",[949,1825,1372],{"class":959},[949,1827,1375],{"class":959},[949,1829,1378],{"class":1010},[949,1831,985],{"class":959},[949,1833,1835],{"class":951,"line":1834},17,[949,1836,1033],{"class":959},[922,1838,1839],{},"真棒！你现在也学会了如何去嵌套循环和分支。当然这里只演示了分支在循环的内部的情形，实际上它们之间可以随意地互相嵌套。本节的练习会提供更多例子供你学习参考。",[918,1841,1842],{"id":1842},"注释和缩进",[922,1844,1845,1846,1850],{},"随着我们代码量的增加，有时候理解代码会出现一定的困难。这个时候就需要",[1847,1848,1849],"strong",{},"注释","（Comment）派上用场了。注释就是对代码的解释和说明，其目的是让人们能够更加轻松地了解代码。在 C++ 中，注释是这样写的：",[940,1852,1854],{"className":942,"code":1853,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a{42}; \u002F\u002F 两条斜杠后面的就是注释。这里声明并定义了一个变量。\n    cout \u003C\u003C a \u003C\u003C endl; \u002F\u002F 将变量 a 的值输出。\n}\n",[935,1855,1856,1866,1876,1886,1903,1922],{"__ignoreMap":945},[949,1857,1858,1860,1862,1864],{"class":951,"line":952},[949,1859,956],{"class":955},[949,1861,960],{"class":959},[949,1863,964],{"class":963},[949,1865,967],{"class":959},[949,1867,1868,1870,1872,1874],{"class":951,"line":970},[949,1869,974],{"class":973},[949,1871,978],{"class":977},[949,1873,982],{"class":981},[949,1875,985],{"class":959},[949,1877,1878,1880,1882,1884],{"class":951,"line":988},[949,1879,991],{"class":977},[949,1881,995],{"class":994},[949,1883,998],{"class":959},[949,1885,1001],{"class":959},[949,1887,1888,1890,1893,1895,1897,1900],{"class":951,"line":1004},[949,1889,1007],{"class":977},[949,1891,1892],{"class":1010}," a",[949,1894,1014],{"class":959},[949,1896,1017],{"class":973},[949,1898,1899],{"class":959},"};",[949,1901,1902],{"class":1026}," \u002F\u002F 两条斜杠后面的就是注释。这里声明并定义了一个变量。\n",[949,1904,1905,1907,1909,1912,1914,1916,1919],{"class":951,"line":1023},[949,1906,1816],{"class":1010},[949,1908,1363],{"class":959},[949,1910,1911],{"class":1010}," a ",[949,1913,1363],{"class":959},[949,1915,1378],{"class":1010},[949,1917,1918],{"class":959},";",[949,1920,1921],{"class":1026}," \u002F\u002F 将变量 a 的值输出。\n",[949,1923,1924],{"class":951,"line":1030},[949,1925,1033],{"class":959},[922,1927,1928,1929,1932],{},"只要出现了两个斜杠 ",[935,1930,1931],{},"\u002F\u002F","  的地方，从此往后一直到本行结尾的地方都是注释了。注释可以随便写，写什么都行；但一般是对本行或者下一行代码的内容说明。为什么注释能随便写？因为编译器在编译程序时会忽视注释的部分，因此一般注释怎样写都不会对编译的结果产生影响。",[922,1934,1935],{},"你会发现这种注释只能写一行。因而还有一种注释方式叫多行注释：",[940,1937,1939],{"className":942,"code":1938,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    \u002F* 斜杠 + 星号 后面的就是多行注释。\n       这一行也是注释。注释一直将持续到表示注释结尾的符号前。\n       星号 + 斜杠就是表示注释结尾的符号。看下面那行：\n    *\u002F\n    int a{42};\n    cout \u003C\u003C a \u003C\u003C endl; \u002F* 当然也可以写成一行的模样。 *\u002F\n}\n",[935,1940,1941,1951,1961,1971,1976,1981,1986,1991,2003,2020],{"__ignoreMap":945},[949,1942,1943,1945,1947,1949],{"class":951,"line":952},[949,1944,956],{"class":955},[949,1946,960],{"class":959},[949,1948,964],{"class":963},[949,1950,967],{"class":959},[949,1952,1953,1955,1957,1959],{"class":951,"line":970},[949,1954,974],{"class":973},[949,1956,978],{"class":977},[949,1958,982],{"class":981},[949,1960,985],{"class":959},[949,1962,1963,1965,1967,1969],{"class":951,"line":988},[949,1964,991],{"class":977},[949,1966,995],{"class":994},[949,1968,998],{"class":959},[949,1970,1001],{"class":959},[949,1972,1973],{"class":951,"line":1004},[949,1974,1975],{"class":1026},"    \u002F* 斜杠 + 星号 后面的就是多行注释。\n",[949,1977,1978],{"class":951,"line":1023},[949,1979,1980],{"class":1026},"       这一行也是注释。注释一直将持续到表示注释结尾的符号前。\n",[949,1982,1983],{"class":951,"line":1030},[949,1984,1985],{"class":1026},"       星号 + 斜杠就是表示注释结尾的符号。看下面那行：\n",[949,1987,1988],{"class":951,"line":1116},[949,1989,1990],{"class":1026},"    *\u002F\n",[949,1992,1993,1995,1997,1999,2001],{"class":951,"line":1121},[949,1994,1007],{"class":977},[949,1996,1892],{"class":1010},[949,1998,1014],{"class":959},[949,2000,1017],{"class":973},[949,2002,1020],{"class":959},[949,2004,2005,2007,2009,2011,2013,2015,2017],{"class":951,"line":1224},[949,2006,1816],{"class":1010},[949,2008,1363],{"class":959},[949,2010,1911],{"class":1010},[949,2012,1363],{"class":959},[949,2014,1378],{"class":1010},[949,2016,1918],{"class":959},[949,2018,2019],{"class":1026}," \u002F* 当然也可以写成一行的模样。 *\u002F\n",[949,2021,2022],{"class":951,"line":1230},[949,2023,1033],{"class":959},[922,2025,2026,2027,2030,2031,2034],{},"多行注释以 ",[935,2028,2029],{},"\u002F*"," 开头，以 ",[935,2032,2033],{},"*\u002F"," 结尾。其中的任意字符都会成为注释。需要注意的是：多行注释不能嵌套。",[922,2036,2037,2038,2040,2041,2044],{},"注释可以很好地提升代码可读性。那么除此之外还有什么提高可读性的办法吗？那就是恰当使用缩进。你一定注意到了，示例代码中如果左大括号 ",[935,2039,1014],{}," 和右大括号 ",[935,2042,2043],{},"}"," 之间出现了整整一行，那么这一行就会向右挪了一点——",[940,2046,2048],{"className":942,"code":2047,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nint main() {\n    int a{0}; \u002F* 注意这一行相比上一行向右挪了 4 个字符：\n^^^^\n就这个 *\u002F\n    while (a \u003C= 10) {\n        a = a + 1; \u002F* 这一行又挪了 4 个字符：\n ->|----|\u003C-\n    缩进   *\u002F\n    }\n}\n",[935,2049,2050,2060,2070,2085,2090,2095,2114,2135,2140,2145,2149],{"__ignoreMap":945},[949,2051,2052,2054,2056,2058],{"class":951,"line":952},[949,2053,956],{"class":955},[949,2055,960],{"class":959},[949,2057,964],{"class":963},[949,2059,967],{"class":959},[949,2061,2062,2064,2066,2068],{"class":951,"line":970},[949,2063,991],{"class":977},[949,2065,995],{"class":994},[949,2067,998],{"class":959},[949,2069,1001],{"class":959},[949,2071,2072,2074,2076,2078,2080,2082],{"class":951,"line":988},[949,2073,1007],{"class":977},[949,2075,1892],{"class":1010},[949,2077,1014],{"class":959},[949,2079,1099],{"class":973},[949,2081,1899],{"class":959},[949,2083,2084],{"class":1026}," \u002F* 注意这一行相比上一行向右挪了 4 个字符：\n",[949,2086,2087],{"class":951,"line":1004},[949,2088,2089],{"class":1026},"^^^^\n",[949,2091,2092],{"class":951,"line":1023},[949,2093,2094],{"class":1026},"就这个 *\u002F\n",[949,2096,2097,2099,2101,2104,2107,2110,2112],{"class":951,"line":1030},[949,2098,1520],{"class":955},[949,2100,1203],{"class":959},[949,2102,2103],{"class":1010},"a ",[949,2105,2106],{"class":959},"\u003C=",[949,2108,2109],{"class":973}," 10",[949,2111,1214],{"class":959},[949,2113,1001],{"class":959},[949,2115,2116,2119,2122,2124,2127,2130,2132],{"class":951,"line":1116},[949,2117,2118],{"class":1359},"        a ",[949,2120,2121],{"class":959},"=",[949,2123,1911],{"class":1359},[949,2125,2126],{"class":959},"+",[949,2128,2129],{"class":973}," 1",[949,2131,1918],{"class":959},[949,2133,2134],{"class":1026}," \u002F* 这一行又挪了 4 个字符：\n",[949,2136,2137],{"class":951,"line":1121},[949,2138,2139],{"class":1026}," ->|----|\u003C-\n",[949,2141,2142],{"class":951,"line":1224},[949,2143,2144],{"class":1026},"    缩进   *\u002F\n",[949,2146,2147],{"class":951,"line":1230},[949,2148,1227],{"class":959},[949,2150,2151],{"class":951,"line":1248},[949,2152,1033],{"class":959},[922,2154,2155,2156,2160,2161,2164,2165,2168],{},"缩进就是指某一行文本相对上一行文本发生了水平的位移。在编程领域，缩进一般是向右平移 4 个字符的宽度。我们代码中采用了加上 4 个空格的方法——实际并不用按那么多次键盘，主流的编辑器只需按一下键盘上的 ",[2157,2158,2159],"kbd",{},"Tab"," 键（位于 ",[2157,2162,2163],{},"Q"," 键的左侧）就可以自动加上 4 个空格（另外，按下 ",[2157,2166,2167],{},"Shift + Tab"," 就可以快速删除 4 个空格）。当然有些较老的编辑器可能是插入 8 个空格或者插入了一个叫“制表符”的东西，这个时候就需要稍微调整一下编辑器设置了。",[922,2170,2171],{},"其实缩进是没有必要的——C++ 程序对空格是不敏感的，也就是说写成这样稀奇古怪的形状：",[940,2173,2175],{"className":942,"code":2174,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nint main() {\nint a{0};\nwhile (a \u003C=             10) {\na = a        +           1;\n}\n}\n",[935,2176,2177,2187,2197,2209,2227,2243,2247],{"__ignoreMap":945},[949,2178,2179,2181,2183,2185],{"class":951,"line":952},[949,2180,956],{"class":955},[949,2182,960],{"class":959},[949,2184,964],{"class":963},[949,2186,967],{"class":959},[949,2188,2189,2191,2193,2195],{"class":951,"line":970},[949,2190,991],{"class":977},[949,2192,995],{"class":994},[949,2194,998],{"class":959},[949,2196,1001],{"class":959},[949,2198,2199,2201,2203,2205,2207],{"class":951,"line":988},[949,2200,991],{"class":977},[949,2202,1892],{"class":1010},[949,2204,1014],{"class":959},[949,2206,1099],{"class":973},[949,2208,1020],{"class":959},[949,2210,2211,2214,2216,2218,2220,2223,2225],{"class":951,"line":1004},[949,2212,2213],{"class":955},"while",[949,2215,1203],{"class":959},[949,2217,2103],{"class":1010},[949,2219,2106],{"class":959},[949,2221,2222],{"class":973},"             10",[949,2224,1214],{"class":959},[949,2226,1001],{"class":959},[949,2228,2229,2231,2233,2236,2238,2241],{"class":951,"line":1023},[949,2230,2103],{"class":1359},[949,2232,2121],{"class":959},[949,2234,2235],{"class":1359}," a        ",[949,2237,2126],{"class":959},[949,2239,2240],{"class":973},"           1",[949,2242,985],{"class":959},[949,2244,2245],{"class":951,"line":1030},[949,2246,1033],{"class":959},[949,2248,2249],{"class":951,"line":1116},[949,2250,1033],{"class":959},[922,2252,2253],{},"也是完全没问题的，但是没有缩进看上去非常不舒服。因为，缩进可以有效分清程序的层级关系（比如看清楚左右大括号的对应关系），也有助于理清思路；因此希望读者们养成经常写注释、正确留缩进的好习惯。总结来说，就是：代码是给计算机看的，而注释和缩进是给我们人类看的。",[918,2255,2256],{"id":2256},"练习",[2258,2259,2260,2264,2267],"ol",{},[2261,2262,2263],"li",{},"平面直角坐标系上有一个长方形，它的四个顶点分别位于 (0,0)，(4,0)，(4,4)，(0,4)。请编写一个程序输出所有长方形内部和边界上的整数点（横纵坐标都为整数的点）。你可以按照任意你喜欢的顺序输出。",[2261,2265,2266],{},"BMI 是衡量人是否健康的一个指标。如果规定 BMI 介于 19 （含）至 24 （含）之间的人是健康的，那么请编写一个程序，输入一个整数作为张三的 BMI ，判断张三是否健康。（如果你愿意的话，你也可以输出他不健康的时候是胖了还是瘦了。）",[2261,2268,2269,2270],{},"编写一个求和的程序。\n",[2258,2271,2272,2275],{},[2261,2273,2274],{},"输入：首先输入一个整数 n。如果 n 是正数的话，则继续输入 n 个整数。",[2261,2276,2277],{},"输出：输出这 n 个整数的和。如果 n 不是正数，则输出一条错误提示。",[918,2279,2280],{"id":2280},"练习参考答案",[940,2282,2284],{"className":942,"code":2283,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int i{0};    \u002F\u002F 横坐标\n    int j{0};    \u002F\u002F 纵坐标\n    while (i \u003C= 4) {   \u002F\u002F 遍历每一“列”\n        j = 0;   \u002F\u002F 定位到每一“列”的第一个位置\n        while (j \u003C= 4) {   \u002F\u002F 遍历每一“行”\n            cout \u003C\u003C \"(\" \u003C\u003C i \u003C\u003C \", \" \u003C\u003C j \u003C\u003C \")\" \u003C\u003C endl;\n            j = j + 1; \u002F\u002F 挪到这一列的下一位置\n        }\n        i = i + 1; \u002F\u002F 挪到下一列\n    }\n}\n",[935,2285,2286,2296,2306,2316,2332,2348,2370,2385,2406,2452,2470,2474,2492,2496],{"__ignoreMap":945},[949,2287,2288,2290,2292,2294],{"class":951,"line":952},[949,2289,956],{"class":955},[949,2291,960],{"class":959},[949,2293,964],{"class":963},[949,2295,967],{"class":959},[949,2297,2298,2300,2302,2304],{"class":951,"line":970},[949,2299,974],{"class":973},[949,2301,978],{"class":977},[949,2303,982],{"class":981},[949,2305,985],{"class":959},[949,2307,2308,2310,2312,2314],{"class":951,"line":988},[949,2309,991],{"class":977},[949,2311,995],{"class":994},[949,2313,998],{"class":959},[949,2315,1001],{"class":959},[949,2317,2318,2320,2323,2325,2327,2329],{"class":951,"line":1004},[949,2319,1007],{"class":977},[949,2321,2322],{"class":1010}," i",[949,2324,1014],{"class":959},[949,2326,1099],{"class":973},[949,2328,1899],{"class":959},[949,2330,2331],{"class":1026},"    \u002F\u002F 横坐标\n",[949,2333,2334,2336,2339,2341,2343,2345],{"class":951,"line":1023},[949,2335,1007],{"class":977},[949,2337,2338],{"class":1010}," j",[949,2340,1014],{"class":959},[949,2342,1099],{"class":973},[949,2344,1899],{"class":959},[949,2346,2347],{"class":1026},"    \u002F\u002F 纵坐标\n",[949,2349,2350,2352,2354,2357,2359,2362,2364,2367],{"class":951,"line":1030},[949,2351,1520],{"class":955},[949,2353,1203],{"class":959},[949,2355,2356],{"class":1010},"i ",[949,2358,2106],{"class":959},[949,2360,2361],{"class":973}," 4",[949,2363,1214],{"class":959},[949,2365,2366],{"class":959}," {",[949,2368,2369],{"class":1026},"   \u002F\u002F 遍历每一“列”\n",[949,2371,2372,2375,2377,2380,2382],{"class":951,"line":1116},[949,2373,2374],{"class":1359},"        j ",[949,2376,2121],{"class":959},[949,2378,2379],{"class":973}," 0",[949,2381,1918],{"class":959},[949,2383,2384],{"class":1026},"   \u002F\u002F 定位到每一“列”的第一个位置\n",[949,2386,2387,2390,2392,2395,2397,2399,2401,2403],{"class":951,"line":1121},[949,2388,2389],{"class":955},"        while",[949,2391,1203],{"class":959},[949,2393,2394],{"class":1359},"j ",[949,2396,2106],{"class":959},[949,2398,2361],{"class":973},[949,2400,1214],{"class":959},[949,2402,2366],{"class":959},[949,2404,2405],{"class":1026},"   \u002F\u002F 遍历每一“行”\n",[949,2407,2408,2410,2412,2414,2417,2419,2421,2424,2426,2428,2431,2433,2435,2438,2440,2442,2444,2446,2448,2450],{"class":951,"line":1224},[949,2409,1555],{"class":1359},[949,2411,1363],{"class":959},[949,2413,1366],{"class":959},[949,2415,2416],{"class":963},"(",[949,2418,1372],{"class":959},[949,2420,1375],{"class":959},[949,2422,2423],{"class":1359}," i ",[949,2425,1363],{"class":959},[949,2427,1366],{"class":959},[949,2429,2430],{"class":963},", ",[949,2432,1372],{"class":959},[949,2434,1375],{"class":959},[949,2436,2437],{"class":1359}," j ",[949,2439,1363],{"class":959},[949,2441,1366],{"class":959},[949,2443,1214],{"class":963},[949,2445,1372],{"class":959},[949,2447,1375],{"class":959},[949,2449,1378],{"class":1359},[949,2451,985],{"class":959},[949,2453,2454,2457,2459,2461,2463,2465,2467],{"class":951,"line":1230},[949,2455,2456],{"class":1359},"            j ",[949,2458,2121],{"class":959},[949,2460,2437],{"class":1359},[949,2462,2126],{"class":959},[949,2464,2129],{"class":973},[949,2466,1918],{"class":959},[949,2468,2469],{"class":1026}," \u002F\u002F 挪到这一列的下一位置\n",[949,2471,2472],{"class":951,"line":1248},[949,2473,1574],{"class":959},[949,2475,2476,2479,2481,2483,2485,2487,2489],{"class":951,"line":1254},[949,2477,2478],{"class":1359},"        i ",[949,2480,2121],{"class":959},[949,2482,2423],{"class":1359},[949,2484,2126],{"class":959},[949,2486,2129],{"class":973},[949,2488,1918],{"class":959},[949,2490,2491],{"class":1026}," \u002F\u002F 挪到下一列\n",[949,2493,2494],{"class":951,"line":1259},[949,2495,1227],{"class":959},[949,2497,2498],{"class":951,"line":1264},[949,2499,1033],{"class":959},[940,2501,2503],{"className":942,"code":2502,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int bmi{0};\n    cin >> bmi;\n    if (bmi >= 19) {\n        if (bmi \u003C= 24) {   \u002F\u002F 当 bmi 大于等于 19 的同时还小于等于 24\n            cout \u003C\u003C \"Healthy.\" \u003C\u003C endl;\n        } else {           \u002F\u002F 当 bmi 大于 24 时\n            cout \u003C\u003C \"Unhealthy: fat.\" \u003C\u003C endl;\n        }\n    } else {               \u002F\u002F 当 bmi 小于 19 时\n        cout \u003C\u003C \"Unhealthy: thin.\" \u003C\u003C endl;\n    }\n}\n",[935,2504,2505,2515,2525,2535,2548,2558,2577,2597,2616,2629,2648,2652,2664,2683,2687],{"__ignoreMap":945},[949,2506,2507,2509,2511,2513],{"class":951,"line":952},[949,2508,956],{"class":955},[949,2510,960],{"class":959},[949,2512,964],{"class":963},[949,2514,967],{"class":959},[949,2516,2517,2519,2521,2523],{"class":951,"line":970},[949,2518,974],{"class":973},[949,2520,978],{"class":977},[949,2522,982],{"class":981},[949,2524,985],{"class":959},[949,2526,2527,2529,2531,2533],{"class":951,"line":988},[949,2528,991],{"class":977},[949,2530,995],{"class":994},[949,2532,998],{"class":959},[949,2534,1001],{"class":959},[949,2536,2537,2539,2542,2544,2546],{"class":951,"line":1004},[949,2538,1007],{"class":977},[949,2540,2541],{"class":1010}," bmi",[949,2543,1014],{"class":959},[949,2545,1099],{"class":973},[949,2547,1020],{"class":959},[949,2549,2550,2552,2554,2556],{"class":951,"line":1023},[949,2551,1106],{"class":1010},[949,2553,1109],{"class":959},[949,2555,2541],{"class":1010},[949,2557,985],{"class":959},[949,2559,2560,2562,2564,2567,2570,2573,2575],{"class":951,"line":1030},[949,2561,1200],{"class":955},[949,2563,1203],{"class":959},[949,2565,2566],{"class":1010},"bmi ",[949,2568,2569],{"class":959},">=",[949,2571,2572],{"class":973}," 19",[949,2574,1214],{"class":959},[949,2576,1001],{"class":959},[949,2578,2579,2581,2583,2585,2587,2590,2592,2594],{"class":951,"line":1116},[949,2580,1538],{"class":955},[949,2582,1203],{"class":959},[949,2584,2566],{"class":1359},[949,2586,2106],{"class":959},[949,2588,2589],{"class":973}," 24",[949,2591,1214],{"class":959},[949,2593,2366],{"class":959},[949,2595,2596],{"class":1026},"   \u002F\u002F 当 bmi 大于等于 19 的同时还小于等于 24\n",[949,2598,2599,2601,2603,2605,2608,2610,2612,2614],{"class":951,"line":1121},[949,2600,1555],{"class":1359},[949,2602,1363],{"class":959},[949,2604,1366],{"class":959},[949,2606,2607],{"class":963},"Healthy.",[949,2609,1372],{"class":959},[949,2611,1375],{"class":959},[949,2613,1378],{"class":1359},[949,2615,985],{"class":959},[949,2617,2618,2621,2624,2626],{"class":951,"line":1224},[949,2619,2620],{"class":959},"        }",[949,2622,2623],{"class":955}," else",[949,2625,2366],{"class":959},[949,2627,2628],{"class":1026},"           \u002F\u002F 当 bmi 大于 24 时\n",[949,2630,2631,2633,2635,2637,2640,2642,2644,2646],{"class":951,"line":1230},[949,2632,1555],{"class":1359},[949,2634,1363],{"class":959},[949,2636,1366],{"class":959},[949,2638,2639],{"class":963},"Unhealthy: fat.",[949,2641,1372],{"class":959},[949,2643,1375],{"class":959},[949,2645,1378],{"class":1359},[949,2647,985],{"class":959},[949,2649,2650],{"class":951,"line":1248},[949,2651,1574],{"class":959},[949,2653,2654,2657,2659,2661],{"class":951,"line":1254},[949,2655,2656],{"class":959},"    }",[949,2658,2623],{"class":955},[949,2660,2366],{"class":959},[949,2662,2663],{"class":1026},"               \u002F\u002F 当 bmi 小于 19 时\n",[949,2665,2666,2668,2670,2672,2675,2677,2679,2681],{"class":951,"line":1259},[949,2667,1360],{"class":1359},[949,2669,1363],{"class":959},[949,2671,1366],{"class":959},[949,2673,2674],{"class":963},"Unhealthy: thin.",[949,2676,1372],{"class":959},[949,2678,1375],{"class":959},[949,2680,1378],{"class":1359},[949,2682,985],{"class":959},[949,2684,2685],{"class":951,"line":1264},[949,2686,1227],{"class":959},[949,2688,2689],{"class":951,"line":1626},[949,2690,1033],{"class":959},[940,2692,2694],{"className":942,"code":2693,"language":944,"meta":945,"style":945},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int n{0};   \u002F\u002F 个数 n\n    int i{1};   \u002F\u002F 用于计数\n    int sum{0}; \u002F\u002F 保存当前计算的和\n    int x{0};   \u002F\u002F 用于输入\n    cin >> n;   \u002F\u002F 输入个数 n\n    if (n > 0) {\n        while (i \u003C= n) { \u002F\u002F 输入 n 个数，i 是当前输入第几个的意思\n            cin >> x;\n            sum = sum + x;  \u002F\u002F 输入并加到 sum 里去\n            i = i + 1;   \u002F\u002F 输入下一个\n        }\n        cout \u003C\u003C sum \u003C\u003C endl;\n    } else {   \u002F\u002F 当 n 非正时输出提示\n        cout \u003C\u003C \"Invalid n!\" \u003C\u003C endl;\n    }\n}\n",[935,2695,2696,2706,2716,2726,2742,2758,2774,2789,2802,2819,2838,2849,2868,2886,2890,2904,2915,2934,2939],{"__ignoreMap":945},[949,2697,2698,2700,2702,2704],{"class":951,"line":952},[949,2699,956],{"class":955},[949,2701,960],{"class":959},[949,2703,964],{"class":963},[949,2705,967],{"class":959},[949,2707,2708,2710,2712,2714],{"class":951,"line":970},[949,2709,974],{"class":973},[949,2711,978],{"class":977},[949,2713,982],{"class":981},[949,2715,985],{"class":959},[949,2717,2718,2720,2722,2724],{"class":951,"line":988},[949,2719,991],{"class":977},[949,2721,995],{"class":994},[949,2723,998],{"class":959},[949,2725,1001],{"class":959},[949,2727,2728,2730,2733,2735,2737,2739],{"class":951,"line":1004},[949,2729,1007],{"class":977},[949,2731,2732],{"class":1010}," n",[949,2734,1014],{"class":959},[949,2736,1099],{"class":973},[949,2738,1899],{"class":959},[949,2740,2741],{"class":1026},"   \u002F\u002F 个数 n\n",[949,2743,2744,2746,2748,2750,2753,2755],{"class":951,"line":1023},[949,2745,1007],{"class":977},[949,2747,2322],{"class":1010},[949,2749,1014],{"class":959},[949,2751,2752],{"class":973},"1",[949,2754,1899],{"class":959},[949,2756,2757],{"class":1026},"   \u002F\u002F 用于计数\n",[949,2759,2760,2762,2765,2767,2769,2771],{"class":951,"line":1030},[949,2761,1007],{"class":977},[949,2763,2764],{"class":1010}," sum",[949,2766,1014],{"class":959},[949,2768,1099],{"class":973},[949,2770,1899],{"class":959},[949,2772,2773],{"class":1026}," \u002F\u002F 保存当前计算的和\n",[949,2775,2776,2778,2780,2782,2784,2786],{"class":951,"line":1116},[949,2777,1007],{"class":977},[949,2779,1094],{"class":1010},[949,2781,1014],{"class":959},[949,2783,1099],{"class":973},[949,2785,1899],{"class":959},[949,2787,2788],{"class":1026},"   \u002F\u002F 用于输入\n",[949,2790,2791,2793,2795,2797,2799],{"class":951,"line":1121},[949,2792,1106],{"class":1010},[949,2794,1109],{"class":959},[949,2796,2732],{"class":1010},[949,2798,1918],{"class":959},[949,2800,2801],{"class":1026},"   \u002F\u002F 输入个数 n\n",[949,2803,2804,2806,2808,2811,2813,2815,2817],{"class":951,"line":1224},[949,2805,1200],{"class":955},[949,2807,1203],{"class":959},[949,2809,2810],{"class":1010},"n ",[949,2812,1209],{"class":959},[949,2814,2379],{"class":973},[949,2816,1214],{"class":959},[949,2818,1001],{"class":959},[949,2820,2821,2823,2825,2827,2829,2831,2833,2835],{"class":951,"line":1230},[949,2822,2389],{"class":955},[949,2824,1203],{"class":959},[949,2826,2356],{"class":1359},[949,2828,2106],{"class":959},[949,2830,2732],{"class":1359},[949,2832,1214],{"class":959},[949,2834,2366],{"class":959},[949,2836,2837],{"class":1026}," \u002F\u002F 输入 n 个数，i 是当前输入第几个的意思\n",[949,2839,2840,2843,2845,2847],{"class":951,"line":1248},[949,2841,2842],{"class":1359},"            cin ",[949,2844,1109],{"class":959},[949,2846,1094],{"class":1359},[949,2848,985],{"class":959},[949,2850,2851,2854,2856,2859,2861,2863,2865],{"class":951,"line":1254},[949,2852,2853],{"class":1359},"            sum ",[949,2855,2121],{"class":959},[949,2857,2858],{"class":1359}," sum ",[949,2860,2126],{"class":959},[949,2862,1094],{"class":1359},[949,2864,1918],{"class":959},[949,2866,2867],{"class":1026},"  \u002F\u002F 输入并加到 sum 里去\n",[949,2869,2870,2873,2875,2877,2879,2881,2883],{"class":951,"line":1259},[949,2871,2872],{"class":1359},"            i ",[949,2874,2121],{"class":959},[949,2876,2423],{"class":1359},[949,2878,2126],{"class":959},[949,2880,2129],{"class":973},[949,2882,1918],{"class":959},[949,2884,2885],{"class":1026},"   \u002F\u002F 输入下一个\n",[949,2887,2888],{"class":951,"line":1264},[949,2889,1574],{"class":959},[949,2891,2892,2894,2896,2898,2900,2902],{"class":951,"line":1626},[949,2893,1360],{"class":1359},[949,2895,1363],{"class":959},[949,2897,2858],{"class":1359},[949,2899,1363],{"class":959},[949,2901,1378],{"class":1359},[949,2903,985],{"class":959},[949,2905,2906,2908,2910,2912],{"class":951,"line":1631},[949,2907,2656],{"class":959},[949,2909,2623],{"class":955},[949,2911,2366],{"class":959},[949,2913,2914],{"class":1026},"   \u002F\u002F 当 n 非正时输出提示\n",[949,2916,2917,2919,2921,2923,2926,2928,2930,2932],{"class":951,"line":1834},[949,2918,1360],{"class":1359},[949,2920,1363],{"class":959},[949,2922,1366],{"class":959},[949,2924,2925],{"class":963},"Invalid 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