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std",[936,1070,1015],{"class":946},[936,1072,1073],{"class":980},"endl",[936,1075,1026],{"class":946},[936,1077,1079],{"class":938,"line":1078},8,[936,1080,1081],{"class":946},"}\n",[922,1083,1084],{},"啊嘞，好像什么也没有发生诶？卡住了？不是，你可以尝试在输出的位置上（或者标有 Input 的地方）用键盘敲上",[1086,1087,1088],"io-block",{},[922,1089,1090],{},"¶12 24↵",[922,1092,1093,1094,1097,1098,1101,1102,1105,1106,1109,1110,1112,1113,1115,1116,1118,1119,1105,1121,1123],{},"其中，“",[933,1095,1096],{},"↵","”代表按下回车键。然后你就观察到了输出 ",[933,1099,1100],{},"36"," 。所以说，这是一个将用户输入的两个整数相加的程序。\n让我们一行一行分析一下。第 3、4 行分别声明并定义了整数类型变量 ",[933,1103,1104],{},"a"," 和 ",[933,1107,1108],{},"b"," ，这件事情我们上一节学过了，而且它们目前的值都是 ",[933,1111,988],{}," 。那么第 5、6 行又在做什么呢？你会发现它的“形状”与输出那一行有些相似。没错，这就是输入了。第 5 行可以允许外界向计算机输入 ",[933,1114,1104],{}," 的值；第 6 行可以允许外界向计算机输入 ",[933,1117,1108],{}," 的值。（这里的外界就是我们计算机的键盘啦。）到现在，变量 ",[933,1120,1104],{},[933,1122,1108],{},"  的值就是刚刚得到的输入的值。第 7、8 行和上一节一样，将两者的和输出。",[1125,1126,1127],"blockquote",{},[922,1128,1129],{},"以后我有时会称“允许外界输入”为“允许用户输入”。这里的用户指的就是使用编译生成的程序的人，也就是运行的时候与程序交互的对象。",[918,1131,1132],{"id":1132},"一块儿输入输出多个东西",[922,1134,1135],{},"感觉刚才的代码有点繁琐啊。实际上，刚才的代码还可以简化一下：把两个输入合在一行！",[926,1137,1139],{"className":928,"code":1138,"language":930,"meta":931,"style":931},"#include \u003Ciostream>\nint main() {\n    int a{0};\n    int b{0};\n    std::cin >> a >> b;\n    std::cout \u003C\u003C a + b \u003C\u003C std::endl;\n}\n",[933,1140,1141,1151,1161,1173,1185,1203,1229],{"__ignoreMap":931},[936,1142,1143,1145,1147,1149],{"class":938,"line":939},[936,1144,943],{"class":942},[936,1146,947],{"class":946},[936,1148,951],{"class":950},[936,1150,954],{"class":946},[936,1152,1153,1155,1157,1159],{"class":938,"line":957},[936,1154,961],{"class":960},[936,1156,965],{"class":964},[936,1158,968],{"class":946},[936,1160,971],{"class":946},[936,1162,1163,1165,1167,1169,1171],{"class":938,"line":974},[936,1164,977],{"class":960},[936,1166,981],{"class":980},[936,1168,984],{"class":946},[936,1170,988],{"class":987},[936,1172,991],{"class":946},[936,1174,1175,1177,1179,1181,1183],{"class":938,"line":994},[936,1176,977],{"class":960},[936,1178,999],{"class":980},[936,1180,984],{"class":946},[936,1182,988],{"class":987},[936,1184,991],{"class":946},[936,1186,1187,1189,1191,1193,1195,1197,1199,1201],{"class":938,"line":1008},[936,1188,1012],{"class":1011},[936,1190,1015],{"class":946},[936,1192,1018],{"class":980},[936,1194,1021],{"class":946},[936,1196,1057],{"class":980},[936,1198,1021],{"class":946},[936,1200,999],{"class":980},[936,1202,1026],{"class":946},[936,1204,1205,1207,1209,1211,1213,1215,1217,1219,1221,1223,1225,1227],{"class":938,"line":1029},[936,1206,1012],{"class":1011},[936,1208,1015],{"class":946},[936,1210,1051],{"class":980},[936,1212,1054],{"class":946},[936,1214,1057],{"class":980},[936,1216,1060],{"class":946},[936,1218,1063],{"class":980},[936,1220,1054],{"class":946},[936,1222,1068],{"class":1011},[936,1224,1015],{"class":946},[936,1226,1073],{"class":980},[936,1228,1026],{"class":946},[936,1230,1231],{"class":938,"line":1044},[936,1232,1081],{"class":946},[922,1234,1235,1236,1238,1239,1241,1242,1245,1246,1250,1251,1260],{},"这是什么操作？事实上这一段代码和刚才的代码是完全一致的：第 5 行要求获取两个输入，分别输入到变量 ",[933,1237,1104],{}," 和变量 ",[933,1240,1108],{}," 。因此总结下来，就是 ",[933,1243,1244],{},"std::cin >>"," 后面可以",[1247,1248,1249],"strong",{},"接上一些变量，表示让外界","（用户的键盘）",[1247,1252,1253,1254,1256,1257],{},"输入这些变量的值。这些变量之间用 ",[933,1255,1021],{}," 分隔。别忘了结尾还要一个分号 ",[933,1258,1259],{},";"," 。",[922,1262,1263],{},"那么你可能会想，既然输入能这样搞，输出能不能呢？答案是肯定的。",[926,1265,1267],{"className":928,"code":1266,"language":930,"meta":931,"style":931},"#include \u003Ciostream>\nint main() {\n    int a{0};\n    int b{0};\n    std::cin >> a >> b;\n    std::cout \u003C\u003C \"The sum is \" \u003C\u003C a + b \u003C\u003C std::endl;\n}\n",[933,1268,1269,1279,1289,1301,1313,1331,1369],{"__ignoreMap":931},[936,1270,1271,1273,1275,1277],{"class":938,"line":939},[936,1272,943],{"class":942},[936,1274,947],{"class":946},[936,1276,951],{"class":950},[936,1278,954],{"class":946},[936,1280,1281,1283,1285,1287],{"class":938,"line":957},[936,1282,961],{"class":960},[936,1284,965],{"class":964},[936,1286,968],{"class":946},[936,1288,971],{"class":946},[936,1290,1291,1293,1295,1297,1299],{"class":938,"line":974},[936,1292,977],{"class":960},[936,1294,981],{"class":980},[936,1296,984],{"class":946},[936,1298,988],{"class":987},[936,1300,991],{"class":946},[936,1302,1303,1305,1307,1309,1311],{"class":938,"line":994},[936,1304,977],{"class":960},[936,1306,999],{"class":980},[936,1308,984],{"class":946},[936,1310,988],{"class":987},[936,1312,991],{"class":946},[936,1314,1315,1317,1319,1321,1323,1325,1327,1329],{"class":938,"line":1008},[936,1316,1012],{"class":1011},[936,1318,1015],{"class":946},[936,1320,1018],{"class":980},[936,1322,1021],{"class":946},[936,1324,1057],{"class":980},[936,1326,1021],{"class":946},[936,1328,999],{"class":980},[936,1330,1026],{"class":946},[936,1332,1333,1335,1337,1339,1341,1344,1347,1350,1353,1355,1357,1359,1361,1363,1365,1367],{"class":938,"line":1029},[936,1334,1012],{"class":1011},[936,1336,1015],{"class":946},[936,1338,1051],{"class":980},[936,1340,1054],{"class":946},[936,1342,1343],{"class":946}," \"",[936,1345,1346],{"class":950},"The sum is ",[936,1348,1349],{"class":946},"\"",[936,1351,1352],{"class":946}," \u003C\u003C",[936,1354,1057],{"class":980},[936,1356,1060],{"class":946},[936,1358,1063],{"class":980},[936,1360,1054],{"class":946},[936,1362,1068],{"class":1011},[936,1364,1015],{"class":946},[936,1366,1073],{"class":980},[936,1368,1026],{"class":946},[936,1370,1371],{"class":938,"line":1044},[936,1372,1081],{"class":946},[922,1374,1375],{},"请看这里的第 6 行，它会使编译运行结果变成这样：",[1086,1377,1378],{},[922,1379,1380],{},"¶12 24↵\nThe sum is 36",[922,1382,1383],{},"::: tip\n此处，输入和输出会用不同颜色的字体，以示区别。\n:::",[922,1385,1386,1387,1389,1390,1393,1394,1397],{},"因此你观察到输出发生了变化。实际上这段代码中的第 6 行输出了两个东西：第一个是“一句话” ",[933,1388,1346],{}," ，第二个是 ",[933,1391,1392],{},"a + b"," 这个简单的式子的值。于是最终你看到的输出就长成 ",[933,1395,1396],{},"The sum is 36","  这个模样了。",[922,1399,1400,1401,1245,1404,1412,1413,1416,1417,1419,1420,1422],{},"总结一下，就是：",[933,1402,1403],{},"std::cout \u003C\u003C",[1247,1405,1406,1407,1409,1410],{},"输出一堆东西（变量、数或者“一句话”），这些东西之间用 ",[933,1408,1054],{}," 分隔，结尾还要一个分号",[933,1411,1259],{}," 。那么细心的读者一定注意到了我似乎忘记了 ",[933,1414,1415],{},"std::endl"," ，那是个什么东西？其实 ",[933,1418,1415],{}," 你现在可以理解为换行。比如如果在输出这一行中间添加一个 ",[933,1421,1415],{},"：",[926,1424,1426],{"className":928,"code":1425,"language":930,"meta":931,"style":931},"#include \u003Ciostream>\nint main() {\n    int a{0};\n    int b{0};\n    std::cin >> a >> b;\n    std::cout \u003C\u003C \"The sum is \" \u003C\u003C std::endl \u003C\u003C a + b \u003C\u003C std::endl;\n}\n",[933,1427,1428,1438,1448,1460,1472,1490,1533],{"__ignoreMap":931},[936,1429,1430,1432,1434,1436],{"class":938,"line":939},[936,1431,943],{"class":942},[936,1433,947],{"class":946},[936,1435,951],{"class":950},[936,1437,954],{"class":946},[936,1439,1440,1442,1444,1446],{"class":938,"line":957},[936,1441,961],{"class":960},[936,1443,965],{"class":964},[936,1445,968],{"class":946},[936,1447,971],{"class":946},[936,1449,1450,1452,1454,1456,1458],{"class":938,"line":974},[936,1451,977],{"class":960},[936,1453,981],{"class":980},[936,1455,984],{"class":946},[936,1457,988],{"class":987},[936,1459,991],{"class":946},[936,1461,1462,1464,1466,1468,1470],{"class":938,"line":994},[936,1463,977],{"class":960},[936,1465,999],{"class":980},[936,1467,984],{"class":946},[936,1469,988],{"class":987},[936,1471,991],{"class":946},[936,1473,1474,1476,1478,1480,1482,1484,1486,1488],{"class":938,"line":1008},[936,1475,1012],{"class":1011},[936,1477,1015],{"class":946},[936,1479,1018],{"class":980},[936,1481,1021],{"class":946},[936,1483,1057],{"class":980},[936,1485,1021],{"class":946},[936,1487,999],{"class":980},[936,1489,1026],{"class":946},[936,1491,1492,1494,1496,1498,1500,1502,1504,1506,1508,1510,1512,1515,1517,1519,1521,1523,1525,1527,1529,1531],{"class":938,"line":1029},[936,1493,1012],{"class":1011},[936,1495,1015],{"class":946},[936,1497,1051],{"class":980},[936,1499,1054],{"class":946},[936,1501,1343],{"class":946},[936,1503,1346],{"class":950},[936,1505,1349],{"class":946},[936,1507,1352],{"class":946},[936,1509,1068],{"class":1011},[936,1511,1015],{"class":946},[936,1513,1514],{"class":980},"endl ",[936,1516,1054],{"class":946},[936,1518,1057],{"class":980},[936,1520,1060],{"class":946},[936,1522,1063],{"class":980},[936,1524,1054],{"class":946},[936,1526,1068],{"class":1011},[936,1528,1015],{"class":946},[936,1530,1073],{"class":980},[936,1532,1026],{"class":946},[936,1534,1535],{"class":938,"line":1044},[936,1536,1081],{"class":946},[922,1538,1539],{},"那么你得到编译运行的结果就是",[1086,1541,1542],{},[922,1543,1544],{},"¶12 24↵\nThe sum is\n36",[922,1546,1547,1548,1550,1551,1260],{},"可以注意到，输出出现 ",[933,1549,1415],{}," 的位置换了一行。我们默认在输出结尾换行，因此一般地输出结尾都要写上 ",[933,1552,1415],{},[1125,1554,1555],{},[922,1556,1557,1558,1560],{},"输出结尾换行只是一个约定俗成的习惯，如果你不愿意写也没关系。实际上 ",[933,1559,1415],{}," 的含义不仅仅是换行，但是目前我们理解为换行就足够了。",[918,1562,1564],{"id":1563},"还能再简洁点吗","还能再简洁点吗？",[922,1566,1567,1568,1571,1572,1575],{},"你会发现我们用于控制输入输出的时候，都在不停地敲 ",[933,1569,1570],{},"std::"," 。这是 C++ 引入的叫做",[1247,1573,1574],{},"命名空间","（Namespace）的玩意儿，如果你觉得这样写很烦的话，也有办法将它们省去。",[926,1577,1579],{"className":928,"code":1578,"language":930,"meta":931,"style":931},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a{0};\n    int b{0};\n    cin >> a >> b;\n    cout \u003C\u003C \"The sum is \" \u003C\u003C endl \u003C\u003C a + b \u003C\u003C endl;\n}\n",[933,1580,1581,1591,1603,1613,1625,1637,1652,1685],{"__ignoreMap":931},[936,1582,1583,1585,1587,1589],{"class":938,"line":939},[936,1584,943],{"class":942},[936,1586,947],{"class":946},[936,1588,951],{"class":950},[936,1590,954],{"class":946},[936,1592,1593,1596,1599,1601],{"class":938,"line":957},[936,1594,1595],{"class":987},"using",[936,1597,1598],{"class":960}," namespace",[936,1600,1068],{"class":1011},[936,1602,1026],{"class":946},[936,1604,1605,1607,1609,1611],{"class":938,"line":974},[936,1606,961],{"class":960},[936,1608,965],{"class":964},[936,1610,968],{"class":946},[936,1612,971],{"class":946},[936,1614,1615,1617,1619,1621,1623],{"class":938,"line":994},[936,1616,977],{"class":960},[936,1618,981],{"class":980},[936,1620,984],{"class":946},[936,1622,988],{"class":987},[936,1624,991],{"class":946},[936,1626,1627,1629,1631,1633,1635],{"class":938,"line":1008},[936,1628,977],{"class":960},[936,1630,999],{"class":980},[936,1632,984],{"class":946},[936,1634,988],{"class":987},[936,1636,991],{"class":946},[936,1638,1639,1642,1644,1646,1648,1650],{"class":938,"line":1029},[936,1640,1641],{"class":980},"    cin ",[936,1643,1021],{"class":946},[936,1645,1057],{"class":980},[936,1647,1021],{"class":946},[936,1649,999],{"class":980},[936,1651,1026],{"class":946},[936,1653,1654,1657,1659,1661,1663,1665,1667,1670,1672,1674,1676,1678,1680,1683],{"class":938,"line":1044},[936,1655,1656],{"class":980},"    cout ",[936,1658,1054],{"class":946},[936,1660,1343],{"class":946},[936,1662,1346],{"class":950},[936,1664,1349],{"class":946},[936,1666,1352],{"class":946},[936,1668,1669],{"class":980}," endl ",[936,1671,1054],{"class":946},[936,1673,1057],{"class":980},[936,1675,1060],{"class":946},[936,1677,1063],{"class":980},[936,1679,1054],{"class":946},[936,1681,1682],{"class":980}," endl",[936,1684,1026],{"class":946},[936,1686,1687],{"class":938,"line":1078},[936,1688,1081],{"class":946},[922,1690,1691,1692,1695,1696,1698],{},"这里，我在很靠近开头的地方加了一句 ",[933,1693,1694],{},"using namespace std;"," 。它的含义请你目前不要太纠结，你只需要知道有了这样一行，从此之后不用再写 ",[933,1697,1570],{}," 了。",[1125,1700,1701],{},[922,1702,1703,1704,1706],{},"事实上写 ",[933,1705,1694],{}," 并不是一个好习惯，在较大的项目中程序员都会避免这种做法。不过本书为了节约篇幅，将在前四章频繁使用；请读者自行决定是否使用这一写法。",[918,1708,1709],{"id":1709},"练习",[1711,1712,1713,1725],"ol",{},[1714,1715,1716,1717,1720,1721,1724],"li",{},"编写这样一个程序，读入三个整数，并以 ",[933,1718,1719],{},"The product is xxx"," 的形式输出它们的积。（提示：三个数的积可以直接用 ",[933,1722,1723],{},"a * b * c"," 的形式给出。）",[1714,1726,1727,1728,1734],{},"（选）尝试完成 ",[1104,1729,1733],{"href":1730,"rel":1731},"http:\u002F\u002Fpoj.org\u002Fproblem?id=1000",[1732],"nofollow","POJ 1000"," 这道题。熟悉注册账号、编写代码、提交等一系列在线评测的过程，这将有助于你未来的学习。",[1736,1737,1738],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sfazB, html 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