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namespace",[940,1122,1124],{"class":1123},"sBMFI"," std",[940,1126,989],{"class":954},[940,1128,1129,1131,1134,1137],{"class":942,"line":992},[940,1130,947],{"class":946},[940,1132,1133],{"class":950}," main",[940,1135,1136],{"class":954},"()",[940,1138,976],{"class":954},[940,1140,1141,1143,1146,1148,1151],{"class":942,"line":1014},[940,1142,982],{"class":946},[940,1144,1145],{"class":985}," a",[940,1147,964],{"class":954},[940,1149,1150],{"class":985}," b",[940,1152,989],{"class":954},[940,1154,1155,1158,1161,1164,1166,1168],{"class":942,"line":1028},[940,1156,1157],{"class":985},"    cin ",[940,1159,1160],{"class":954},">>",[940,1162,1163],{"class":985}," a ",[940,1165,1160],{"class":954},[940,1167,1150],{"class":985},[940,1169,989],{"class":954},[940,1171,1172,1174,1177],{"class":942,"line":1039},[940,1173,982],{"class":946},[940,1175,1176],{"class":985}," c",[940,1178,989],{"class":954},[940,1180,1181,1183,1185,1188,1190,1192,1194],{"class":942,"line":1050},[940,1182,996],{"class":995},[940,1184,999],{"class":954},[940,1186,1187],{"class":985},"a ",[940,1189,1005],{"class":954},[940,1191,1150],{"class":985},[940,1193,973],{"class":954},[940,1195,976],{"class":954},[940,1197,1198,1201,1203,1205],{"class":942,"line":1056},[940,1199,1200],{"class":1017},"        c ",[940,1202,1021],{"class":954},[940,1204,1145],{"class":1017},[940,1206,989],{"class":954},[940,1208,1209,1211,1213],{"class":942,"line":1066},[940,1210,1031],{"class":954},[940,1212,1034],{"class":995},[940,1214,976],{"class":954},[940,1216,1218,1220,1222,1224],{"class":942,"line":1217},10,[940,1219,1200],{"class":1017},[940,1221,1021],{"class":954},[940,1223,1150],{"class":1017},[940,1225,989],{"class":954},[940,1227,1229],{"class":942,"line":1228},11,[940,1230,1053],{"class":954},[940,1232,1234,1237,1240,1243,1245,1248],{"class":942,"line":1233},12,[940,1235,1236],{"class":985},"    cout ",[940,1238,1239],{"class":954},"\u003C\u003C",[940,1241,1242],{"class":985}," c ",[940,1244,1239],{"class":954},[940,1246,1247],{"class":985}," endl",[940,1249,989],{"class":954},[940,1251,1253],{"class":942,"line":1252},13,[940,1254,1069],{"class":954},[922,1256,1257],{},"而使用函数把比较的那一部分拿出来的话，则得到了完全等价的代码。",[931,1259,1261],{"className":933,"code":1260,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\nusing namespace std;\nint max(int x1, int x2) {\n    int y;\n    if (x1 > x2) {\n        y = x1;\n    } else {\n        y = x2;\n    }\n    return y;\n}\nint main() {\n    int a, b;\n    cin >> a >> b;\n    int c;\n    c = max(a, b);\n    cout \u003C\u003C c \u003C\u003C endl;\n}\n",[926,1262,1263,1273,1283,1305,1313,1329,1339,1347,1357,1361,1369,1373,1383,1395,1410,1419,1441,1456],{"__ignoreMap":936},[940,1264,1265,1267,1269,1271],{"class":942,"line":943},[940,1266,1101],{"class":995},[940,1268,1104],{"class":954},[940,1270,1108],{"class":1107},[940,1272,1111],{"class":954},[940,1274,1275,1277,1279,1281],{"class":942,"line":979},[940,1276,1117],{"class":1116},[940,1278,1120],{"class":946},[940,1280,1124],{"class":1123},[940,1282,989],{"class":954},[940,1284,1285,1287,1289,1291,1293,1295,1297,1299,1301,1303],{"class":942,"line":992},[940,1286,947],{"class":946},[940,1288,951],{"class":950},[940,1290,955],{"class":954},[940,1292,947],{"class":946},[940,1294,961],{"class":960},[940,1296,964],{"class":954},[940,1298,967],{"class":946},[940,1300,970],{"class":960},[940,1302,973],{"class":954},[940,1304,976],{"class":954},[940,1306,1307,1309,1311],{"class":942,"line":1014},[940,1308,982],{"class":946},[940,1310,986],{"class":985},[940,1312,989],{"class":954},[940,1314,1315,1317,1319,1321,1323,1325,1327],{"class":942,"line":1028},[940,1316,996],{"class":995},[940,1318,999],{"class":954},[940,1320,1002],{"class":985},[940,1322,1005],{"class":954},[940,1324,970],{"class":985},[940,1326,973],{"class":954},[940,1328,976],{"class":954},[940,1330,1331,1333,1335,1337],{"class":942,"line":1039},[940,1332,1018],{"class":1017},[940,1334,1021],{"class":954},[940,1336,961],{"class":1017},[940,1338,989],{"class":954},[940,1340,1341,1343,1345],{"class":942,"line":1050},[940,1342,1031],{"class":954},[940,1344,1034],{"class":995},[940,1346,976],{"class":954},[940,1348,1349,1351,1353,1355],{"class":942,"line":1056},[940,1350,1018],{"class":1017},[940,1352,1021],{"class":954},[940,1354,970],{"class":1017},[940,1356,989],{"class":954},[940,1358,1359],{"class":942,"line":1066},[940,1360,1053],{"class":954},[940,1362,1363,1365,1367],{"class":942,"line":1217},[940,1364,1059],{"class":995},[940,1366,986],{"class":985},[940,1368,989],{"class":954},[940,1370,1371],{"class":942,"line":1228},[940,1372,1069],{"class":954},[940,1374,1375,1377,1379,1381],{"class":942,"line":1233},[940,1376,947],{"class":946},[940,1378,1133],{"class":950},[940,1380,1136],{"class":954},[940,1382,976],{"class":954},[940,1384,1385,1387,1389,1391,1393],{"class":942,"line":1252},[940,1386,982],{"class":946},[940,1388,1145],{"class":985},[940,1390,964],{"class":954},[940,1392,1150],{"class":985},[940,1394,989],{"class":954},[940,1396,1398,1400,1402,1404,1406,1408],{"class":942,"line":1397},14,[940,1399,1157],{"class":985},[940,1401,1160],{"class":954},[940,1403,1163],{"class":985},[940,1405,1160],{"class":954},[940,1407,1150],{"class":985},[940,1409,989],{"class":954},[940,1411,1413,1415,1417],{"class":942,"line":1412},15,[940,1414,982],{"class":946},[940,1416,1176],{"class":985},[940,1418,989],{"class":954},[940,1420,1422,1425,1427,1429,1431,1434,1436,1438],{"class":942,"line":1421},16,[940,1423,1424],{"class":985},"    c ",[940,1426,1021],{"class":954},[940,1428,951],{"class":950},[940,1430,955],{"class":954},[940,1432,1433],{"class":985},"a",[940,1435,964],{"class":954},[940,1437,1150],{"class":985},[940,1439,1440],{"class":954},");\n",[940,1442,1444,1446,1448,1450,1452,1454],{"class":942,"line":1443},17,[940,1445,1236],{"class":985},[940,1447,1239],{"class":954},[940,1449,1242],{"class":985},[940,1451,1239],{"class":954},[940,1453,1247],{"class":985},[940,1455,989],{"class":954},[940,1457,1459],{"class":942,"line":1458},18,[940,1460,1069],{"class":954},[922,1462,1463,1464,1466,1467,1469],{},"也就是说，",[926,1465,928],{}," 函数将原来代码中 7 到 11 行的部分独立出来；换句话说，把这几行所代表的那段过程用 ",[926,1468,928],{}," 函数所表示了出来。",[922,1471,1472],{},"正因为函数只是过程的体现，所以我可以把任何语句放入函数中：",[931,1474,1476],{"className":933,"code":1475,"language":935,"meta":936,"style":936},"int max(int x1, int x2) {\n    cout \u003C\u003C \"Hello, function!\" \u003C\u003C endl;\n    return x1 > x2 ? x1 : x2;\n}\n",[926,1477,1478,1500,1522,1546],{"__ignoreMap":936},[940,1479,1480,1482,1484,1486,1488,1490,1492,1494,1496,1498],{"class":942,"line":943},[940,1481,947],{"class":946},[940,1483,951],{"class":950},[940,1485,955],{"class":954},[940,1487,947],{"class":946},[940,1489,961],{"class":960},[940,1491,964],{"class":954},[940,1493,967],{"class":946},[940,1495,970],{"class":960},[940,1497,973],{"class":954},[940,1499,976],{"class":954},[940,1501,1502,1504,1506,1509,1512,1515,1518,1520],{"class":942,"line":979},[940,1503,1236],{"class":985},[940,1505,1239],{"class":954},[940,1507,1508],{"class":954}," \"",[940,1510,1511],{"class":1107},"Hello, function!",[940,1513,1514],{"class":954},"\"",[940,1516,1517],{"class":954}," \u003C\u003C",[940,1519,1247],{"class":985},[940,1521,989],{"class":954},[940,1523,1524,1526,1529,1531,1534,1537,1539,1542,1544],{"class":942,"line":992},[940,1525,1059],{"class":995},[940,1527,1528],{"class":985}," x1 ",[940,1530,1005],{"class":954},[940,1532,1533],{"class":985}," x2 ",[940,1535,1536],{"class":954},"?",[940,1538,1528],{"class":985},[940,1540,1541],{"class":954},":",[940,1543,970],{"class":985},[940,1545,989],{"class":954},[940,1547,1548],{"class":942,"line":1014},[940,1549,1069],{"class":954},[922,1551,1552,1553,1555],{},"只不过就是把输出这条命令放入了 ",[926,1554,928],{}," 函数规定的过程中。",[918,1557,1558],{"id":1558},"形式参数与返回值",[922,1560,1561,1562,1565,1566,1569,1570,1573],{},"函数在执行它所代表的过程的时候，可以",[1077,1563,1564],{},"接收","一些外部的数据，也可以把一些数据**（如根据接收的数据进行运算的结果）传回",[1077,1567,1568],{},"外部。因此，过去我们说的函数的“变元”实际上就是接收外部数据的一种方式。这些接受的数据需要以变量的形式存储，称这些变量为","形式参数**（Parameter），简称",[1077,1571,1572],{},"形参","。",[931,1575,1577],{"className":933,"code":1576,"language":935,"meta":936,"style":936},"int max(int x1, int x2) { \u002F\u002F x1 和 x2 就是形参\n    return x1 > x2 ? x1 : x2;\n}\n",[926,1578,1579,1606,1626],{"__ignoreMap":936},[940,1580,1581,1583,1585,1587,1589,1591,1593,1595,1597,1599,1602],{"class":942,"line":943},[940,1582,947],{"class":946},[940,1584,951],{"class":950},[940,1586,955],{"class":954},[940,1588,947],{"class":946},[940,1590,961],{"class":960},[940,1592,964],{"class":954},[940,1594,967],{"class":946},[940,1596,970],{"class":960},[940,1598,973],{"class":954},[940,1600,1601],{"class":954}," {",[940,1603,1605],{"class":1604},"sHwdD"," \u002F\u002F x1 和 x2 就是形参\n",[940,1607,1608,1610,1612,1614,1616,1618,1620,1622,1624],{"class":942,"line":979},[940,1609,1059],{"class":995},[940,1611,1528],{"class":985},[940,1613,1005],{"class":954},[940,1615,1533],{"class":985},[940,1617,1536],{"class":954},[940,1619,1528],{"class":985},[940,1621,1541],{"class":954},[940,1623,970],{"class":985},[940,1625,989],{"class":954},[940,1627,1628],{"class":942,"line":992},[940,1629,1069],{"class":954},[922,1631,1632,1633,1635,1636,1638,1639,1642,1643,1573],{},"这个例子中，函数（过程）",[926,1634,928],{}," 需要接收两个数据，并通过一段过程将这两个数据的较大的那个传回去。因此这两个数据以两个 ",[926,1637,947],{}," 类型变量的形式传入，也就是变量 ",[926,1640,1641],{},"x1"," 和 ",[926,1644,1645],{},"x2",[922,1647,1648],{},"那么如果这个函数不需要外界提供任何数据呢？那么就有了无形参的函数：",[931,1650,1652],{"className":933,"code":1651,"language":935,"meta":936,"style":936},"int getInput() {  \u002F\u002F 没有形参\n    int n;\n    cin >> n;\n    return n;\n}\n",[926,1653,1654,1668,1677,1687,1695],{"__ignoreMap":936},[940,1655,1656,1658,1661,1663,1665],{"class":942,"line":943},[940,1657,947],{"class":946},[940,1659,1660],{"class":950}," getInput",[940,1662,1136],{"class":954},[940,1664,1601],{"class":954},[940,1666,1667],{"class":1604},"  \u002F\u002F 没有形参\n",[940,1669,1670,1672,1675],{"class":942,"line":979},[940,1671,982],{"class":946},[940,1673,1674],{"class":985}," n",[940,1676,989],{"class":954},[940,1678,1679,1681,1683,1685],{"class":942,"line":992},[940,1680,1157],{"class":985},[940,1682,1160],{"class":954},[940,1684,1674],{"class":985},[940,1686,989],{"class":954},[940,1688,1689,1691,1693],{"class":942,"line":1014},[940,1690,1059],{"class":995},[940,1692,1674],{"class":985},[940,1694,989],{"class":954},[940,1696,1697],{"class":942,"line":1028},[940,1698,1069],{"class":954},[922,1700,1701,1702,1705,1706,1709,1710,1712],{},"这个 ",[926,1703,1704],{},"getInput"," 函数实际上表达了“输入一个整数”这个过程，并将输入的这个数传回给使用这个函数的地方——比如我在别的地方写下 ",[926,1707,1708],{},"a = getInput();"," 的时候，变量 ",[926,1711,1433],{}," 就被赋值为刚刚输入的那个数。",[922,1714,1715,1716,1719,1720,1723],{},"函数“传回”的这个值被称为函数的",[1077,1717,1718],{},"返回值","。如果想要传回返回值，需要将这个值写在 ",[926,1721,1722],{},"return"," 后面（被称为 return 语句，见下文）。函数返回值的类型是固定的，必须在函数开头就呈现出来。比如：",[931,1725,1727],{"className":933,"code":1726,"language":935,"meta":936,"style":936},"unsigned int abs(int x) { \u002F\u002F unsigned int 是函数的返回值类型\n    unsigned int y;\n    y = (x >= 0 ? x : -x);\n    return y; \u002F\u002F 变量 y 的值就是这个函数的返回值\n}\n",[926,1728,1729,1753,1764,1798,1810],{"__ignoreMap":936},[940,1730,1731,1734,1736,1739,1741,1743,1746,1748,1750],{"class":942,"line":943},[940,1732,1733],{"class":946},"unsigned",[940,1735,967],{"class":946},[940,1737,1738],{"class":950}," abs",[940,1740,955],{"class":954},[940,1742,947],{"class":946},[940,1744,1745],{"class":960}," x",[940,1747,973],{"class":954},[940,1749,1601],{"class":954},[940,1751,1752],{"class":1604}," \u002F\u002F unsigned int 是函数的返回值类型\n",[940,1754,1755,1758,1760,1762],{"class":942,"line":979},[940,1756,1757],{"class":946},"    unsigned",[940,1759,967],{"class":946},[940,1761,986],{"class":985},[940,1763,989],{"class":954},[940,1765,1766,1769,1771,1773,1776,1779,1782,1785,1788,1790,1793,1796],{"class":942,"line":992},[940,1767,1768],{"class":985},"    y ",[940,1770,1021],{"class":954},[940,1772,999],{"class":954},[940,1774,1775],{"class":985},"x ",[940,1777,1778],{"class":954},">=",[940,1780,1781],{"class":1116}," 0",[940,1783,1784],{"class":954}," ?",[940,1786,1787],{"class":985}," x ",[940,1789,1541],{"class":954},[940,1791,1792],{"class":954}," -",[940,1794,1795],{"class":985},"x",[940,1797,1440],{"class":954},[940,1799,1800,1802,1804,1807],{"class":942,"line":1014},[940,1801,1059],{"class":995},[940,1803,986],{"class":985},[940,1805,1806],{"class":954},";",[940,1808,1809],{"class":1604}," \u002F\u002F 变量 y 的值就是这个函数的返回值\n",[940,1811,1812],{"class":942,"line":1028},[940,1813,1069],{"class":954},[922,1815,1816,1817,1820],{},"如果一个函数不需要传回任何数据，那么可以不写返回值。此时需要强调的是，返回值类型被称为 ",[926,1818,1819],{},"void","。请看下例：",[931,1822,1824],{"className":933,"code":1823,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\nusing namespace std;\nvoid printNum(int x) {\n    cout \u003C\u003C x \u003C\u003C endl;\n}\nint main() {\n    printNum(42);\n}\n",[926,1825,1826,1836,1846,1863,1877,1881,1891,1903],{"__ignoreMap":936},[940,1827,1828,1830,1832,1834],{"class":942,"line":943},[940,1829,1101],{"class":995},[940,1831,1104],{"class":954},[940,1833,1108],{"class":1107},[940,1835,1111],{"class":954},[940,1837,1838,1840,1842,1844],{"class":942,"line":979},[940,1839,1117],{"class":1116},[940,1841,1120],{"class":946},[940,1843,1124],{"class":1123},[940,1845,989],{"class":954},[940,1847,1848,1850,1853,1855,1857,1859,1861],{"class":942,"line":992},[940,1849,1819],{"class":946},[940,1851,1852],{"class":950}," printNum",[940,1854,955],{"class":954},[940,1856,947],{"class":946},[940,1858,1745],{"class":960},[940,1860,973],{"class":954},[940,1862,976],{"class":954},[940,1864,1865,1867,1869,1871,1873,1875],{"class":942,"line":1014},[940,1866,1236],{"class":985},[940,1868,1239],{"class":954},[940,1870,1787],{"class":985},[940,1872,1239],{"class":954},[940,1874,1247],{"class":985},[940,1876,989],{"class":954},[940,1878,1879],{"class":942,"line":1028},[940,1880,1069],{"class":954},[940,1882,1883,1885,1887,1889],{"class":942,"line":1039},[940,1884,947],{"class":946},[940,1886,1133],{"class":950},[940,1888,1136],{"class":954},[940,1890,976],{"class":954},[940,1892,1893,1896,1898,1901],{"class":942,"line":1050},[940,1894,1895],{"class":950},"    printNum",[940,1897,955],{"class":954},[940,1899,1900],{"class":1116},"42",[940,1902,1440],{"class":954},[940,1904,1905],{"class":942,"line":1056},[940,1906,1069],{"class":954},[922,1908,1909,1910,1913,1914,1916,1917,1919,1920,1922,1923,1926],{},"这里 ",[926,1911,1912],{},"printNum"," 执行了“输出一个整数”的过程。因此它不需要传回什么类似计算结果的值。这时，函数的返回值类型写作 ",[926,1915,1819],{},"，同时也不需要写 ",[926,1918,1722],{}," 那一行了：当返回 ",[926,1921,1819],{}," 的函数抵达函数体的最后一行时，会自动退出函数的执行。因为没有返回值，所以诸如 ",[926,1924,1925],{},"a = printNum(42);"," 这种写法显然是错误的。",[922,1928,1929,1931,1932,1935],{},[926,1930,1819],{}," 是 C++ 关键字，是",[1077,1933,1934],{},"空类型","（Void type）的类型说明符，但永远不存在空类型的变量。",[1937,1938,1939],"blockquote",{},[922,1940,1941],{},"实际上，空类型是永远无法被完整定义的不完整类型。",[922,1943,1944],{},"最后一个例子展示了既没有形参，也没有返回值的一个函数。",[931,1946,1948],{"className":933,"code":1947,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\nusing namespace std;\nvoid show() {\n    cout \u003C\u003C \"*************************************\" \u003C\u003C endl;\n    cout \u003C\u003C \"*     System error has occurred.    *\" \u003C\u003C endl;\n    cout \u003C\u003C \"* Please contact the administrator. *\" \u003C\u003C endl;\n    cout \u003C\u003C \"*    Sorry for the inconvenience.   *\" \u003C\u003C endl;\n    cout \u003C\u003C \"*************************************\" \u003C\u003C endl;\n}\nint main() {\n    show();\n}\n",[926,1949,1950,1960,1970,1981,2000,2019,2038,2057,2075,2079,2089,2097],{"__ignoreMap":936},[940,1951,1952,1954,1956,1958],{"class":942,"line":943},[940,1953,1101],{"class":995},[940,1955,1104],{"class":954},[940,1957,1108],{"class":1107},[940,1959,1111],{"class":954},[940,1961,1962,1964,1966,1968],{"class":942,"line":979},[940,1963,1117],{"class":1116},[940,1965,1120],{"class":946},[940,1967,1124],{"class":1123},[940,1969,989],{"class":954},[940,1971,1972,1974,1977,1979],{"class":942,"line":992},[940,1973,1819],{"class":946},[940,1975,1976],{"class":950}," show",[940,1978,1136],{"class":954},[940,1980,976],{"class":954},[940,1982,1983,1985,1987,1989,1992,1994,1996,1998],{"class":942,"line":1014},[940,1984,1236],{"class":985},[940,1986,1239],{"class":954},[940,1988,1508],{"class":954},[940,1990,1991],{"class":1107},"*************************************",[940,1993,1514],{"class":954},[940,1995,1517],{"class":954},[940,1997,1247],{"class":985},[940,1999,989],{"class":954},[940,2001,2002,2004,2006,2008,2011,2013,2015,2017],{"class":942,"line":1028},[940,2003,1236],{"class":985},[940,2005,1239],{"class":954},[940,2007,1508],{"class":954},[940,2009,2010],{"class":1107},"*     System error has occurred.    *",[940,2012,1514],{"class":954},[940,2014,1517],{"class":954},[940,2016,1247],{"class":985},[940,2018,989],{"class":954},[940,2020,2021,2023,2025,2027,2030,2032,2034,2036],{"class":942,"line":1039},[940,2022,1236],{"class":985},[940,2024,1239],{"class":954},[940,2026,1508],{"class":954},[940,2028,2029],{"class":1107},"* Please contact the administrator. *",[940,2031,1514],{"class":954},[940,2033,1517],{"class":954},[940,2035,1247],{"class":985},[940,2037,989],{"class":954},[940,2039,2040,2042,2044,2046,2049,2051,2053,2055],{"class":942,"line":1050},[940,2041,1236],{"class":985},[940,2043,1239],{"class":954},[940,2045,1508],{"class":954},[940,2047,2048],{"class":1107},"*    Sorry for the inconvenience.   *",[940,2050,1514],{"class":954},[940,2052,1517],{"class":954},[940,2054,1247],{"class":985},[940,2056,989],{"class":954},[940,2058,2059,2061,2063,2065,2067,2069,2071,2073],{"class":942,"line":1056},[940,2060,1236],{"class":985},[940,2062,1239],{"class":954},[940,2064,1508],{"class":954},[940,2066,1991],{"class":1107},[940,2068,1514],{"class":954},[940,2070,1517],{"class":954},[940,2072,1247],{"class":985},[940,2074,989],{"class":954},[940,2076,2077],{"class":942,"line":1066},[940,2078,1069],{"class":954},[940,2080,2081,2083,2085,2087],{"class":942,"line":1217},[940,2082,947],{"class":946},[940,2084,1133],{"class":950},[940,2086,1136],{"class":954},[940,2088,976],{"class":954},[940,2090,2091,2094],{"class":942,"line":1228},[940,2092,2093],{"class":950},"    show",[940,2095,2096],{"class":954},"();\n",[940,2098,2099],{"class":942,"line":1233},[940,2100,1069],{"class":954},[922,2102,2103,2104,2107,2108,2110],{},"函数 ",[926,2105,2106],{},"show"," 是一个什么也没有的函数，它就是纯粹地展示了函数的本分——执行一段过程。这里 ",[926,2109,2106],{}," 所指明的过程是输出一些提示信息。",[918,2112,2114],{"id":2113},"为什么","为什么？",[922,2116,2117],{},"刚刚说过，函数的作用就是将程序的一部分过程提取出来。那么我们为什么非得要提取出来？直接放在原来的位置上不好吗？",[922,2119,2120,2121,1642,2123,2126,2127,1642,2129,2132],{},"请看这个例子。这段代码中，先求出 ",[926,2122,1433],{},[926,2124,2125],{},"b"," 的最大值并输出，又求出 ",[926,2128,2125],{},[926,2130,2131],{},"c"," 的最大值并输出。",[931,2134,2136],{"className":933,"code":2135,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a, b, c;\n    cin >> a >> b >> c;\n    int maxab;\n    if (a > b) maxab = a;\n    else maxab = b;\n    cout \u003C\u003C \"Max of (a, b) is \" \u003C\u003C maxab \u003C\u003C endl;\n    int maxbc;\n    if (b > c) maxbc = b;\n    else maxbc = c;\n    cout \u003C\u003C \"Max of (b, c) is \" \u003C\u003C maxbc \u003C\u003C endl;\n}\n",[926,2137,2138,2148,2158,2168,2184,2203,2212,2235,2248,2271,2280,2304,2316,2339],{"__ignoreMap":936},[940,2139,2140,2142,2144,2146],{"class":942,"line":943},[940,2141,1101],{"class":995},[940,2143,1104],{"class":954},[940,2145,1108],{"class":1107},[940,2147,1111],{"class":954},[940,2149,2150,2152,2154,2156],{"class":942,"line":979},[940,2151,1117],{"class":1116},[940,2153,1120],{"class":946},[940,2155,1124],{"class":1123},[940,2157,989],{"class":954},[940,2159,2160,2162,2164,2166],{"class":942,"line":992},[940,2161,947],{"class":946},[940,2163,1133],{"class":950},[940,2165,1136],{"class":954},[940,2167,976],{"class":954},[940,2169,2170,2172,2174,2176,2178,2180,2182],{"class":942,"line":1014},[940,2171,982],{"class":946},[940,2173,1145],{"class":985},[940,2175,964],{"class":954},[940,2177,1150],{"class":985},[940,2179,964],{"class":954},[940,2181,1176],{"class":985},[940,2183,989],{"class":954},[940,2185,2186,2188,2190,2192,2194,2197,2199,2201],{"class":942,"line":1028},[940,2187,1157],{"class":985},[940,2189,1160],{"class":954},[940,2191,1163],{"class":985},[940,2193,1160],{"class":954},[940,2195,2196],{"class":985}," b ",[940,2198,1160],{"class":954},[940,2200,1176],{"class":985},[940,2202,989],{"class":954},[940,2204,2205,2207,2210],{"class":942,"line":1039},[940,2206,982],{"class":946},[940,2208,2209],{"class":985}," maxab",[940,2211,989],{"class":954},[940,2213,2214,2216,2218,2220,2222,2224,2226,2229,2231,2233],{"class":942,"line":1050},[940,2215,996],{"class":995},[940,2217,999],{"class":954},[940,2219,1187],{"class":985},[940,2221,1005],{"class":954},[940,2223,1150],{"class":985},[940,2225,973],{"class":954},[940,2227,2228],{"class":985}," maxab ",[940,2230,1021],{"class":954},[940,2232,1145],{"class":985},[940,2234,989],{"class":954},[940,2236,2237,2240,2242,2244,2246],{"class":942,"line":1056},[940,2238,2239],{"class":995},"    else",[940,2241,2228],{"class":985},[940,2243,1021],{"class":954},[940,2245,1150],{"class":985},[940,2247,989],{"class":954},[940,2249,2250,2252,2254,2256,2259,2261,2263,2265,2267,2269],{"class":942,"line":1066},[940,2251,1236],{"class":985},[940,2253,1239],{"class":954},[940,2255,1508],{"class":954},[940,2257,2258],{"class":1107},"Max of (a, b) is ",[940,2260,1514],{"class":954},[940,2262,1517],{"class":954},[940,2264,2228],{"class":985},[940,2266,1239],{"class":954},[940,2268,1247],{"class":985},[940,2270,989],{"class":954},[940,2272,2273,2275,2278],{"class":942,"line":1217},[940,2274,982],{"class":946},[940,2276,2277],{"class":985}," maxbc",[940,2279,989],{"class":954},[940,2281,2282,2284,2286,2289,2291,2293,2295,2298,2300,2302],{"class":942,"line":1228},[940,2283,996],{"class":995},[940,2285,999],{"class":954},[940,2287,2288],{"class":985},"b ",[940,2290,1005],{"class":954},[940,2292,1176],{"class":985},[940,2294,973],{"class":954},[940,2296,2297],{"class":985}," maxbc ",[940,2299,1021],{"class":954},[940,2301,1150],{"class":985},[940,2303,989],{"class":954},[940,2305,2306,2308,2310,2312,2314],{"class":942,"line":1233},[940,2307,2239],{"class":995},[940,2309,2297],{"class":985},[940,2311,1021],{"class":954},[940,2313,1176],{"class":985},[940,2315,989],{"class":954},[940,2317,2318,2320,2322,2324,2327,2329,2331,2333,2335,2337],{"class":942,"line":1252},[940,2319,1236],{"class":985},[940,2321,1239],{"class":954},[940,2323,1508],{"class":954},[940,2325,2326],{"class":1107},"Max of (b, c) is ",[940,2328,1514],{"class":954},[940,2330,1517],{"class":954},[940,2332,2297],{"class":985},[940,2334,1239],{"class":954},[940,2336,1247],{"class":985},[940,2338,989],{"class":954},[940,2340,2341],{"class":942,"line":1397},[940,2342,1069],{"class":954},[922,2344,2345],{},"但你会发现这两次求值的代码几乎是一样的，只有变量名不同；也就是说我们几乎把一段代码抄了两遍。如果我们把这段过程用函数来概括起来，则可以用较少的代码量就实现了原来同样的功能。",[931,2347,2349],{"className":933,"code":2348,"language":935,"meta":936,"style":936},"#include \u003Ciostream>\nusing namespace std;\nint max(int x,int y) {\n    if (x > y) return x;\n    else return y;\n}\nint main() {\n    int a, b, c;\n    cin >> a >> b >> c;\n    cout \u003C\u003C \"Max of (a, b) is \" \u003C\u003C max(a, b) \u003C\u003C endl;\n    cout \u003C\u003C \"Max of (b, c) is \" \u003C\u003C max(b, c) \u003C\u003C endl;\n}\n",[926,2350,2351,2361,2371,2393,2414,2424,2428,2438,2454,2472,2504,2536],{"__ignoreMap":936},[940,2352,2353,2355,2357,2359],{"class":942,"line":943},[940,2354,1101],{"class":995},[940,2356,1104],{"class":954},[940,2358,1108],{"class":1107},[940,2360,1111],{"class":954},[940,2362,2363,2365,2367,2369],{"class":942,"line":979},[940,2364,1117],{"class":1116},[940,2366,1120],{"class":946},[940,2368,1124],{"class":1123},[940,2370,989],{"class":954},[940,2372,2373,2375,2377,2379,2381,2383,2385,2387,2389,2391],{"class":942,"line":992},[940,2374,947],{"class":946},[940,2376,951],{"class":950},[940,2378,955],{"class":954},[940,2380,947],{"class":946},[940,2382,1745],{"class":960},[940,2384,964],{"class":954},[940,2386,947],{"class":946},[940,2388,986],{"class":960},[940,2390,973],{"class":954},[940,2392,976],{"class":954},[940,2394,2395,2397,2399,2401,2403,2405,2407,2410,2412],{"class":942,"line":1014},[940,2396,996],{"class":995},[940,2398,999],{"class":954},[940,2400,1775],{"class":985},[940,2402,1005],{"class":954},[940,2404,986],{"class":985},[940,2406,973],{"class":954},[940,2408,2409],{"class":995}," return",[940,2411,1745],{"class":985},[940,2413,989],{"class":954},[940,2415,2416,2418,2420,2422],{"class":942,"line":1028},[940,2417,2239],{"class":995},[940,2419,2409],{"class":995},[940,2421,986],{"class":985},[940,2423,989],{"class":954},[940,2425,2426],{"class":942,"line":1039},[940,2427,1069],{"class":954},[940,2429,2430,2432,2434,2436],{"class":942,"line":1050},[940,2431,947],{"class":946},[940,2433,1133],{"class":950},[940,2435,1136],{"class":954},[940,2437,976],{"class":954},[940,2439,2440,2442,2444,2446,2448,2450,2452],{"class":942,"line":1056},[940,2441,982],{"class":946},[940,2443,1145],{"class":985},[940,2445,964],{"class":954},[940,2447,1150],{"class":985},[940,2449,964],{"class":954},[940,2451,1176],{"class":985},[940,2453,989],{"class":954},[940,2455,2456,2458,2460,2462,2464,2466,2468,2470],{"class":942,"line":1066},[940,2457,1157],{"class":985},[940,2459,1160],{"class":954},[940,2461,1163],{"class":985},[940,2463,1160],{"class":954},[940,2465,2196],{"class":985},[940,2467,1160],{"class":954},[940,2469,1176],{"class":985},[940,2471,989],{"class":954},[940,2473,2474,2476,2478,2480,2482,2484,2486,2488,2490,2492,2494,2496,2498,2500,2502],{"class":942,"line":1217},[940,2475,1236],{"class":985},[940,2477,1239],{"class":954},[940,2479,1508],{"class":954},[940,2481,2258],{"class":1107},[940,2483,1514],{"class":954},[940,2485,1517],{"class":954},[940,2487,951],{"class":950},[940,2489,955],{"class":954},[940,2491,1433],{"class":985},[940,2493,964],{"class":954},[940,2495,1150],{"class":985},[940,2497,973],{"class":954},[940,2499,1517],{"class":954},[940,2501,1247],{"class":985},[940,2503,989],{"class":954},[940,2505,2506,2508,2510,2512,2514,2516,2518,2520,2522,2524,2526,2528,2530,2532,2534],{"class":942,"line":1228},[940,2507,1236],{"class":985},[940,2509,1239],{"class":954},[940,2511,1508],{"class":954},[940,2513,2326],{"class":1107},[940,2515,1514],{"class":954},[940,2517,1517],{"class":954},[940,2519,951],{"class":950},[940,2521,955],{"class":954},[940,2523,2125],{"class":985},[940,2525,964],{"class":954},[940,2527,1176],{"class":985},[940,2529,973],{"class":954},[940,2531,1517],{"class":954},[940,2533,1247],{"class":985},[940,2535,989],{"class":954},[940,2537,2538],{"class":942,"line":1233},[940,2539,1069],{"class":954},[922,2541,2542],{},"从这个角度出发，函数所体现的用途就是：减少重复或相似的代码，提高可读性。",[2544,2545,2546],"style",{},"html 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