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3",[933,1125,1031],{"class":943},[933,1127,985],{"class":943},[933,1129,1131,1133,1135,1137,1140,1142,1144,1146],{"class":935,"line":1130},11,[933,1132,1040],{"class":1039},[933,1134,1043],{"class":943},[933,1136,1046],{"class":943},[933,1138,1139],{"class":947},"three",[933,1141,1052],{"class":943},[933,1143,1055],{"class":943},[933,1145,1058],{"class":1039},[933,1147,969],{"class":943},[933,1149,1151,1153,1155,1157,1159,1161,1163,1166,1168],{"class":935,"line":1150},12,[933,1152,1066],{"class":943},[933,1154,1069],{"class":939},[933,1156,1072],{"class":939},[933,1158,1019],{"class":943},[933,1160,1022],{"class":994},[933,1162,1025],{"class":943},[933,1164,1165],{"class":957}," 4",[933,1167,1031],{"class":943},[933,1169,985],{"class":943},[933,1171,1173,1175,1177,1179,1182,1184,1186,1188],{"class":935,"line":1172},13,[933,1174,1040],{"class":1039},[933,1176,1043],{"class":943},[933,1178,1046],{"class":943},[933,1180,1181],{"class":947},"four",[933,1183,1052],{"class":943},[933,1185,1055],{"class":943},[933,1187,1058],{"class":1039},[933,1189,969],{"class":943},[933,1191,1193,1195,1197,1199,1201,1203,1205,1208,1210],{"class":935,"line":1192},14,[933,1194,1066],{"class":943},[933,1196,1069],{"class":939},[933,1198,1072],{"class":939},[933,1200,1019],{"class":943},[933,1202,1022],{"class":994},[933,1204,1025],{"class":943},[933,1206,1207],{"class":957}," 5",[933,1209,1031],{"class":943},[933,1211,985],{"class":943},[933,1213,1215,1217,1219,1221,1224,1226,1228,1230],{"class":935,"line":1214},15,[933,1216,1040],{"class":1039},[933,1218,1043],{"class":943},[933,1220,1046],{"class":943},[933,1222,1223],{"class":947},"five",[933,1225,1052],{"class":943},[933,1227,1055],{"class":943},[933,1229,1058],{"class":1039},[933,1231,969],{"class":943},[933,1233,1235,1237,1239],{"class":935,"line":1234},16,[933,1236,1066],{"class":943},[933,1238,1069],{"class":939},[933,1240,985],{"class":943},[933,1242,1244,1246,1248,1250,1253,1255,1257,1259],{"class":935,"line":1243},17,[933,1245,1040],{"class":1039},[933,1247,1043],{"class":943},[933,1249,1046],{"class":943},[933,1251,1252],{"class":947},"wrong",[933,1254,1052],{"class":943},[933,1256,1055],{"class":943},[933,1258,1058],{"class":1039},[933,1260,969],{"class":943},[933,1262,1264],{"class":935,"line":1263},18,[933,1265,1266],{"class":943},"    }\n",[933,1268,1270],{"class":935,"line":1269},19,[933,1271,1272],{"class":943},"}\n",[919,1274,1275],{},"你会发现这样写有一点繁琐。switch 语句可以一定程度上简化这种逻辑的写法。来看看 switch 语句如何实现：",[923,1277,1279],{"className":925,"code":1278,"language":927,"meta":928,"style":928},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a;\n    cin >> a;\n    switch (a) {\n        case 1: cout \u003C\u003C \"one\" \u003C\u003C endl; break;\n        case 2: cout \u003C\u003C \"two\" \u003C\u003C endl; break;\n        case 3: cout \u003C\u003C \"three\" \u003C\u003C endl; break;\n        case 4: cout \u003C\u003C \"four\" \u003C\u003C endl; break;\n        case 5: cout \u003C\u003C \"five\" \u003C\u003C endl; break;\n        default: cout \u003C\u003C \"wrong\" \u003C\u003C endl; break;\n    }\n}\n",[930,1280,1281,1291,1301,1311,1319,1329,1343,1376,1404,1432,1460,1488,1515,1519],{"__ignoreMap":928},[933,1282,1283,1285,1287,1289],{"class":935,"line":936},[933,1284,940],{"class":939},[933,1286,944],{"class":943},[933,1288,948],{"class":947},[933,1290,951],{"class":943},[933,1292,1293,1295,1297,1299],{"class":935,"line":954},[933,1294,958],{"class":957},[933,1296,962],{"class":961},[933,1298,966],{"class":965},[933,1300,969],{"class":943},[933,1302,1303,1305,1307,1309],{"class":935,"line":972},[933,1304,975],{"class":961},[933,1306,979],{"class":978},[933,1308,982],{"class":943},[933,1310,985],{"class":943},[933,1312,1313,1315,1317],{"class":935,"line":988},[933,1314,991],{"class":961},[933,1316,995],{"class":994},[933,1318,969],{"class":943},[933,1320,1321,1323,1325,1327],{"class":935,"line":1000},[933,1322,1003],{"class":994},[933,1324,1006],{"class":943},[933,1326,995],{"class":994},[933,1328,969],{"class":943},[933,1330,1331,1334,1336,1339,1341],{"class":935,"line":1013},[933,1332,1333],{"class":939},"    switch",[933,1335,1019],{"class":943},[933,1337,1338],{"class":1039},"a",[933,1340,1031],{"class":943},[933,1342,985],{"class":943},[933,1344,1345,1348,1350,1353,1356,1358,1360,1362,1364,1366,1368,1371,1374],{"class":935,"line":1036},[933,1346,1347],{"class":939},"        case",[933,1349,1028],{"class":957},[933,1351,1352],{"class":943},":",[933,1354,1355],{"class":1039}," cout ",[933,1357,1043],{"class":943},[933,1359,1046],{"class":943},[933,1361,1049],{"class":947},[933,1363,1052],{"class":943},[933,1365,1055],{"class":943},[933,1367,1058],{"class":1039},[933,1369,1370],{"class":943},";",[933,1372,1373],{"class":939}," break",[933,1375,969],{"class":943},[933,1377,1378,1380,1382,1384,1386,1388,1390,1392,1394,1396,1398,1400,1402],{"class":935,"line":1063},[933,1379,1347],{"class":939},[933,1381,1081],{"class":957},[933,1383,1352],{"class":943},[933,1385,1355],{"class":1039},[933,1387,1043],{"class":943},[933,1389,1046],{"class":943},[933,1391,1097],{"class":947},[933,1393,1052],{"class":943},[933,1395,1055],{"class":943},[933,1397,1058],{"class":1039},[933,1399,1370],{"class":943},[933,1401,1373],{"class":939},[933,1403,969],{"class":943},[933,1405,1406,1408,1410,1412,1414,1416,1418,1420,1422,1424,1426,1428,1430],{"class":935,"line":1088},[933,1407,1347],{"class":939},[933,1409,1123],{"class":957},[933,1411,1352],{"class":943},[933,1413,1355],{"class":1039},[933,1415,1043],{"class":943},[933,1417,1046],{"class":943},[933,1419,1139],{"class":947},[933,1421,1052],{"class":943},[933,1423,1055],{"class":943},[933,1425,1058],{"class":1039},[933,1427,1370],{"class":943},[933,1429,1373],{"class":939},[933,1431,969],{"class":943},[933,1433,1434,1436,1438,1440,1442,1444,1446,1448,1450,1452,1454,1456,1458],{"class":935,"line":1108},[933,1435,1347],{"class":939},[933,1437,1165],{"class":957},[933,1439,1352],{"class":943},[933,1441,1355],{"class":1039},[933,1443,1043],{"class":943},[933,1445,1046],{"class":943},[933,1447,1181],{"class":947},[933,1449,1052],{"class":943},[933,1451,1055],{"class":943},[933,1453,1058],{"class":1039},[933,1455,1370],{"class":943},[933,1457,1373],{"class":939},[933,1459,969],{"class":943},[933,1461,1462,1464,1466,1468,1470,1472,1474,1476,1478,1480,1482,1484,1486],{"class":935,"line":1130},[933,1463,1347],{"class":939},[933,1465,1207],{"class":957},[933,1467,1352],{"class":943},[933,1469,1355],{"class":1039},[933,1471,1043],{"class":943},[933,1473,1046],{"class":943},[933,1475,1223],{"class":947},[933,1477,1052],{"class":943},[933,1479,1055],{"class":943},[933,1481,1058],{"class":1039},[933,1483,1370],{"class":943},[933,1485,1373],{"class":939},[933,1487,969],{"class":943},[933,1489,1490,1493,1495,1497,1499,1501,1503,1505,1507,1509,1511,1513],{"class":935,"line":1150},[933,1491,1492],{"class":939},"        default",[933,1494,1352],{"class":943},[933,1496,1355],{"class":1039},[933,1498,1043],{"class":943},[933,1500,1046],{"class":943},[933,1502,1252],{"class":947},[933,1504,1052],{"class":943},[933,1506,1055],{"class":943},[933,1508,1058],{"class":1039},[933,1510,1370],{"class":943},[933,1512,1373],{"class":939},[933,1514,969],{"class":943},[933,1516,1517],{"class":935,"line":1172},[933,1518,1266],{"class":943},[933,1520,1521],{"class":935,"line":1192},[933,1522,1272],{"class":943},[919,1524,1525,1526,1530],{},"这段代码可以很好地完成任务，你可以自己试一下。现在来仔细观察一下这段代码，其中 switch 语句的典型结构",[1527,1528,1529],"em",{},"大致","是这样的：",[1532,1533,1534],"sdsc",{},[919,1535,1536,1537,1540,1541,1543,1544,1547],{},"\"switch (\"表达式\") {\"\n\"case\" 常量1\":\" ",[933,1538,1539],{},"语句...","\n\"case\" 常量2\":\" ",[933,1542,1539],{},"\n...\":\" ",[933,1545,1546],{},"...","\n\"default:\" 语句...\n\"}\"",[919,1549,1550,1551,1554,1555,1558,1559,1561,1562,1565,1566,1568,1569,1561,1571,1565,1574,1576,1577,1579,1580,1583],{},"switch 语句的执行过程是这样的：计算 ",[930,1552,1553],{},"@表达式@"," 的值，然后依次检查逐个 ",[930,1556,1557],{},"case"," 后面的常量：若 ",[930,1560,1553],{}," 的值和 ",[930,1563,1564],{},"@常量1@"," 相等，则开始执行 ",[930,1567,1564],{}," 后面的语句；否则，若 ",[930,1570,1553],{},[930,1572,1573],{},"@常量2@",[930,1575,1573],{}," 后面的语句。这样一直做下去，如果 ",[930,1578,1553],{}," 的值和上述任意一个常量都不相等，则开始执行 ",[930,1581,1582],{},"default:"," 后面的语句。",[919,1585,1586,1587,1590,1591,1593,1594,1598,1599,1602],{},"其中，",[930,1588,1589],{},"@\"case\" 常量\":\"@"," 和 ",[930,1592,1582],{}," 被称为",[1595,1596,1597],"strong",{},"标号","（Label），它决定了程序执行 switch 语句的",[1595,1600,1601],{},"入口","。也就是说，标号决定了程序从哪里开始执行语句，但没有决定到哪里结束执行语句。",[919,1604,1605,1606,1609,1610,1613],{},"为什么这样说？你会发现上面程序有一些东西我还没有讲：每一行最后的 ",[930,1607,1608],{},"break;"," 是什么？",[930,1611,1612],{},"break"," 是 C++ 的一个关键字，它再加上一个分号就组成了 break 语句。为了体现 break 语句的作用，你可以先把它们都删掉：",[923,1615,1617],{"className":925,"code":1616,"language":927,"meta":928,"style":928},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a;\n    cin >> a;\n    switch (a) {\n        case 1: cout \u003C\u003C \"one\" \u003C\u003C endl;\n        case 2: cout \u003C\u003C \"two\" \u003C\u003C endl;\n        case 3: cout \u003C\u003C \"three\" \u003C\u003C endl;\n        case 4: cout \u003C\u003C \"four\" \u003C\u003C endl;\n        case 5: cout \u003C\u003C \"five\" \u003C\u003C endl;\n        default: cout \u003C\u003C \"wrong\" \u003C\u003C endl;\n    }\n}\n",[930,1618,1619,1629,1639,1649,1657,1667,1679,1703,1727,1751,1775,1799,1821,1825],{"__ignoreMap":928},[933,1620,1621,1623,1625,1627],{"class":935,"line":936},[933,1622,940],{"class":939},[933,1624,944],{"class":943},[933,1626,948],{"class":947},[933,1628,951],{"class":943},[933,1630,1631,1633,1635,1637],{"class":935,"line":954},[933,1632,958],{"class":957},[933,1634,962],{"class":961},[933,1636,966],{"class":965},[933,1638,969],{"class":943},[933,1640,1641,1643,1645,1647],{"class":935,"line":972},[933,1642,975],{"class":961},[933,1644,979],{"class":978},[933,1646,982],{"class":943},[933,1648,985],{"class":943},[933,1650,1651,1653,1655],{"class":935,"line":988},[933,1652,991],{"class":961},[933,1654,995],{"class":994},[933,1656,969],{"class":943},[933,1658,1659,1661,1663,1665],{"class":935,"line":1000},[933,1660,1003],{"class":994},[933,1662,1006],{"class":943},[933,1664,995],{"class":994},[933,1666,969],{"class":943},[933,1668,1669,1671,1673,1675,1677],{"class":935,"line":1013},[933,1670,1333],{"class":939},[933,1672,1019],{"class":943},[933,1674,1338],{"class":1039},[933,1676,1031],{"class":943},[933,1678,985],{"class":943},[933,1680,1681,1683,1685,1687,1689,1691,1693,1695,1697,1699,1701],{"class":935,"line":1036},[933,1682,1347],{"class":939},[933,1684,1028],{"class":957},[933,1686,1352],{"class":943},[933,1688,1355],{"class":1039},[933,1690,1043],{"class":943},[933,1692,1046],{"class":943},[933,1694,1049],{"class":947},[933,1696,1052],{"class":943},[933,1698,1055],{"class":943},[933,1700,1058],{"class":1039},[933,1702,969],{"class":943},[933,1704,1705,1707,1709,1711,1713,1715,1717,1719,1721,1723,1725],{"class":935,"line":1063},[933,1706,1347],{"class":939},[933,1708,1081],{"class":957},[933,1710,1352],{"class":943},[933,1712,1355],{"class":1039},[933,1714,1043],{"class":943},[933,1716,1046],{"class":943},[933,1718,1097],{"class":947},[933,1720,1052],{"class":943},[933,1722,1055],{"class":943},[933,1724,1058],{"class":1039},[933,1726,969],{"class":943},[933,1728,1729,1731,1733,1735,1737,1739,1741,1743,1745,1747,1749],{"class":935,"line":1088},[933,1730,1347],{"class":939},[933,1732,1123],{"class":957},[933,1734,1352],{"class":943},[933,1736,1355],{"class":1039},[933,1738,1043],{"class":943},[933,1740,1046],{"class":943},[933,1742,1139],{"class":947},[933,1744,1052],{"class":943},[933,1746,1055],{"class":943},[933,1748,1058],{"class":1039},[933,1750,969],{"class":943},[933,1752,1753,1755,1757,1759,1761,1763,1765,1767,1769,1771,1773],{"class":935,"line":1108},[933,1754,1347],{"class":939},[933,1756,1165],{"class":957},[933,1758,1352],{"class":943},[933,1760,1355],{"class":1039},[933,1762,1043],{"class":943},[933,1764,1046],{"class":943},[933,1766,1181],{"class":947},[933,1768,1052],{"class":943},[933,1770,1055],{"class":943},[933,1772,1058],{"class":1039},[933,1774,969],{"class":943},[933,1776,1777,1779,1781,1783,1785,1787,1789,1791,1793,1795,1797],{"class":935,"line":1130},[933,1778,1347],{"class":939},[933,1780,1207],{"class":957},[933,1782,1352],{"class":943},[933,1784,1355],{"class":1039},[933,1786,1043],{"class":943},[933,1788,1046],{"class":943},[933,1790,1223],{"class":947},[933,1792,1052],{"class":943},[933,1794,1055],{"class":943},[933,1796,1058],{"class":1039},[933,1798,969],{"class":943},[933,1800,1801,1803,1805,1807,1809,1811,1813,1815,1817,1819],{"class":935,"line":1150},[933,1802,1492],{"class":939},[933,1804,1352],{"class":943},[933,1806,1355],{"class":1039},[933,1808,1043],{"class":943},[933,1810,1046],{"class":943},[933,1812,1252],{"class":947},[933,1814,1052],{"class":943},[933,1816,1055],{"class":943},[933,1818,1058],{"class":1039},[933,1820,969],{"class":943},[933,1822,1823],{"class":935,"line":1172},[933,1824,1266],{"class":943},[933,1826,1827],{"class":935,"line":1192},[933,1828,1272],{"class":943},[919,1830,1831],{},"然后你可以尝试编译运行：",[1833,1834,1835],"io-block",{},[919,1836,1837],{},"¶3↵\nthree\nfour\nfive\nwrong",[919,1839,1840,1841,1844,1845,1847,1848,1850,1851,1853,1854,1856,1857,1860,1861,1863,1864,1866,1867,1869,1870,1872],{},"你会发现运行的结果不一样了：当输入 ",[930,1842,1843],{},"3"," 的时候，它把第六行到第九行的所有语句都执行了。这是因为，标号只规定了 switch 执行的入口，而没有指定出口。当 ",[930,1846,1338],{}," 为 ",[930,1849,1843],{}," 的时候，程序会检查每一个 ",[930,1852,1557],{}," 标号的常量是否与 ",[930,1855,1338],{}," 相等，在第六行的 ",[930,1858,1859],{},"case 3:"," 这个标号处成立，于是开始执行它后面的所有语句：第六行输出 ",[930,1862,1139],{}," 、第七行输出 ",[930,1865,1181],{}," 、第八行输出 ",[930,1868,1223],{}," ，最后一行输出 ",[930,1871,1252],{}," 。由于没有规定出口，因此程序会一直执行到 switch 语句的大括号结束。",[919,1874,1875,1876,1879,1880,1847,1882,1884],{},"那么这个时候就轮到 break 语句出场了。",[1595,1877,1878],{},"在 switch 语句中，执行 break 语句会退出 switch 语句的执行","。因此，在每个标号的“最后”加上 break 语句，就可以实现程序入口和出口的统一。比如在最初的那段代码中，当 ",[930,1881,1338],{},[930,1883,1843],{}," 的时候，程序在第六行进入，执行输出语句，随后执行 break 语句，便退出了 switch。这就是我们想要的结果了。",[919,1886,1887],{},"在某些时候，入口和出口不必统一。比如写一个程序判断输入的字母是否为“元音字母”，那么可以直接：",[923,1889,1891],{"className":925,"code":1890,"language":927,"meta":928,"style":928},"char c;\ncin >> c;\nswitch (c) {\n    case 'a':\n    case 'e':\n    case 'i':\n    case 'o':\n    case 'u': cout \u003C\u003C \"Yes\" \u003C\u003C endl; break;\n    default: cout \u003C\u003C \"No\" \u003C\u003C endl; break;\n}\n",[930,1892,1893,1903,1914,1928,1944,1957,1970,1983,2016,2042],{"__ignoreMap":928},[933,1894,1895,1898,1901],{"class":935,"line":936},[933,1896,1897],{"class":961},"char",[933,1899,1900],{"class":994}," c",[933,1902,969],{"class":943},[933,1904,1905,1908,1910,1912],{"class":935,"line":954},[933,1906,1907],{"class":994},"cin ",[933,1909,1006],{"class":943},[933,1911,1900],{"class":994},[933,1913,969],{"class":943},[933,1915,1916,1919,1921,1924,1926],{"class":935,"line":972},[933,1917,1918],{"class":939},"switch",[933,1920,1019],{"class":943},[933,1922,1923],{"class":994},"c",[933,1925,1031],{"class":943},[933,1927,985],{"class":943},[933,1929,1930,1933,1936,1938,1941],{"class":935,"line":988},[933,1931,1932],{"class":939},"    case",[933,1934,1935],{"class":943}," '",[933,1937,1338],{"class":947},[933,1939,1940],{"class":943},"'",[933,1942,1943],{"class":1039},":\n",[933,1945,1946,1948,1950,1953,1955],{"class":935,"line":1000},[933,1947,1932],{"class":939},[933,1949,1935],{"class":943},[933,1951,1952],{"class":947},"e",[933,1954,1940],{"class":943},[933,1956,1943],{"class":1039},[933,1958,1959,1961,1963,1966,1968],{"class":935,"line":1013},[933,1960,1932],{"class":939},[933,1962,1935],{"class":943},[933,1964,1965],{"class":947},"i",[933,1967,1940],{"class":943},[933,1969,1943],{"class":1039},[933,1971,1972,1974,1976,1979,1981],{"class":935,"line":1036},[933,1973,1932],{"class":939},[933,1975,1935],{"class":943},[933,1977,1978],{"class":947},"o",[933,1980,1940],{"class":943},[933,1982,1943],{"class":1039},[933,1984,1985,1987,1989,1992,1994,1997,1999,2001,2004,2006,2008,2010,2012,2014],{"class":935,"line":1063},[933,1986,1932],{"class":939},[933,1988,1935],{"class":943},[933,1990,1991],{"class":947},"u",[933,1993,1940],{"class":943},[933,1995,1996],{"class":1039},": cout ",[933,1998,1043],{"class":943},[933,2000,1046],{"class":943},[933,2002,2003],{"class":947},"Yes",[933,2005,1052],{"class":943},[933,2007,1055],{"class":943},[933,2009,1058],{"class":1039},[933,2011,1370],{"class":943},[933,2013,1373],{"class":939},[933,2015,969],{"class":943},[933,2017,2018,2021,2023,2025,2027,2030,2032,2034,2036,2038,2040],{"class":935,"line":1088},[933,2019,2020],{"class":939},"    default",[933,2022,1996],{"class":1039},[933,2024,1043],{"class":943},[933,2026,1046],{"class":943},[933,2028,2029],{"class":947},"No",[933,2031,1052],{"class":943},[933,2033,1055],{"class":943},[933,2035,1058],{"class":1039},[933,2037,1370],{"class":943},[933,2039,1373],{"class":939},[933,2041,969],{"class":943},[933,2043,2044],{"class":935,"line":1108},[933,2045,1272],{"class":943},[919,2047,2048,2049,2052,2053,2055,2056,2059,2060,2062,2063,2065],{},"这里，前四个标号没有“对应的” break 语句，那么进入这四个标号就会直接执行第五个标号 ",[930,2050,2051],{},"case 'u'"," 下面的输出语句；因此对于这五个标号都可以输出 ",[930,2054,2003],{}," 并退出。若不是元音字母，则落入 ",[930,2057,2058],{},"default"," 标号，此时输出 ",[930,2061,2029],{}," 并退出。（",[930,2064,2058],{}," 标号的 break 语句是可选的。）",[2067,2068,2069],"blockquote",{},[919,2070,2071,2072,2075],{},"switch 语句中，控制穿过其它 case 标号的行为（即不写 break 语句）称为直落（Fall through）。编译器可能对直落发出警告。你可以用 ",[930,2073,2074],{},"[[fallthrough]]"," 属性来避免这一警告。",[2077,2078,2079],"h2",{"id":2079},"注意事项",[919,2081,2082,2083,2085,2086,2088],{},"switch 语句中的 ",[930,2084,1553],{}," 必须是整数类型或者可以隐式转换为整数类型；case 标号中的常量必须可以隐式转换为与 ",[930,2087,1553],{}," 相同的类型。",[919,2090,2091],{},"尽量避免在 switch 语句中使用声明语句。若使用，你可能需要用复合语句的形式将其括起，因为编译器可能不允许某些变量的声明跨越标号。",[2067,2093,2094],{},[919,2095,2096,2097,2100],{},"switch 语句的主体部分是一个复合语句，但也可以是任意的其它语句，比如某些极客可能会写出 ",[930,2098,2099],{},"switch (...) for (...) { }"," 之类的代码。",[2067,2102,2103],{},[919,2104,2105],{},"if 语句和 switch 语句在条件表达式的位置上也可以放单个变量、带初始化器的声明（没有分号）。此时进入分支的条件取决于这个被声明并定义的变量（可能按语境隐式转换）的值。",[2107,2108,2109],"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 code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":928,"searchDepth":936,"depth":954,"links":2111},[2112],{"id":2079,"depth":954,"text":2079},"请考虑这样一个现实问题：输入一个不大于 5 的正整数，输出它的英文单词。","md",null,{},{"icon":190},{"title":220,"description":2113},"4alo1PlYJNRbrqSXmbABl-v78FnAjzOK4IuYolmAiIw",[2121,2123],{"title":216,"path":217,"stem":218,"description":2122,"icon":190,"children":-1},"作用域（Scope）是一个很关键的概念。为了演示，我们先从复合语句谈起",{"title":224,"path":225,"stem":226,"description":2124,"icon":190,"children":-1},"循环语句（Iteration statement）是控制程序重复执行某个动作的语句。",1784618117143]