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1",[938,1015,1016],{"class":976},";\n",[938,1018,1020],{"class":965,"line":1019},3,[938,1021,1022],{"class":976},"}\n",[922,1024,1025,1026],{},"读者们看了可能一脸懵逼，这啥玩意儿啊？请看下图，这段代码里面至少体现了一个函数的几个关键信息：定义域、陪域、函数名以及函数的解析式：\n",[1027,1028],"img",{"alt":1029,"src":1030},"function","https:\u002F\u002Fs1.ax1x.com\u002F2020\u002F07\u002F14\u002FUUrcdg.png",[922,1032,1033,1034,1037],{},"目前咱们先不要管“为什么写成这个鬼样子”、“",[950,1035,1036],{},"return"," 是啥意思”，照葫芦画瓢写就是了。",[922,1039,1040,1041,1044],{},"你可以把这段代码放在 ",[950,1042,1043],{},"int main() {"," 的上面，然后你就可以像数学上的写法一样去使用这个函数。请看下面的例子：",[955,1046,1048],{"className":957,"code":1047,"language":959,"meta":960,"style":960},"#include \u003Ciostream>\nusing namespace std;\nint f(int x) {\n    return 2 * x + 1;\n}\nint main() {\n    int x{42};\n    int y{0};\n    y = f(x); \u002F\u002F 使用刚才的函数 f(x)\n    cout \u003C\u003C y \u003C\u003C endl;\n}\n",[950,1049,1050,1065,1079,1095,1112,1117,1130,1147,1162,1185,1204],{"__ignoreMap":960},[938,1051,1052,1055,1058,1062],{"class":965,"line":966},[938,1053,1054],{"class":995},"#include",[938,1056,1057],{"class":976}," \u003C",[938,1059,1061],{"class":1060},"sfazB","iostream",[938,1063,1064],{"class":976},">\n",[938,1066,1067,1070,1073,1077],{"class":965,"line":992},[938,1068,1069],{"class":999},"using",[938,1071,1072],{"class":969}," namespace",[938,1074,1076],{"class":1075},"sBMFI"," std",[938,1078,1016],{"class":976},[938,1080,1081,1083,1085,1087,1089,1091,1093],{"class":965,"line":1019},[938,1082,952],{"class":969},[938,1084,973],{"class":972},[938,1086,977],{"class":976},[938,1088,952],{"class":969},[938,1090,983],{"class":982},[938,1092,986],{"class":976},[938,1094,989],{"class":976},[938,1096,1098,1100,1102,1104,1106,1108,1110],{"class":965,"line":1097},4,[938,1099,996],{"class":995},[938,1101,1000],{"class":999},[938,1103,1003],{"class":976},[938,1105,1007],{"class":1006},[938,1107,1010],{"class":976},[938,1109,1013],{"class":999},[938,1111,1016],{"class":976},[938,1113,1115],{"class":965,"line":1114},5,[938,1116,1022],{"class":976},[938,1118,1120,1122,1125,1128],{"class":965,"line":1119},6,[938,1121,952],{"class":969},[938,1123,1124],{"class":972}," main",[938,1126,1127],{"class":976},"()",[938,1129,989],{"class":976},[938,1131,1133,1136,1138,1141,1144],{"class":965,"line":1132},7,[938,1134,1135],{"class":969},"    int",[938,1137,983],{"class":1006},[938,1139,1140],{"class":976},"{",[938,1142,1143],{"class":999},"42",[938,1145,1146],{"class":976},"};\n",[938,1148,1150,1152,1155,1157,1160],{"class":965,"line":1149},8,[938,1151,1135],{"class":969},[938,1153,1154],{"class":1006}," y",[938,1156,1140],{"class":976},[938,1158,1159],{"class":999},"0",[938,1161,1146],{"class":976},[938,1163,1165,1168,1171,1173,1175,1178,1181],{"class":965,"line":1164},9,[938,1166,1167],{"class":1006},"    y ",[938,1169,1170],{"class":976},"=",[938,1172,973],{"class":972},[938,1174,977],{"class":976},[938,1176,1177],{"class":1006},"x",[938,1179,1180],{"class":976},");",[938,1182,1184],{"class":1183},"sHwdD"," \u002F\u002F 使用刚才的函数 f(x)\n",[938,1186,1188,1191,1194,1197,1199,1202],{"class":965,"line":1187},10,[938,1189,1190],{"class":1006},"    cout ",[938,1192,1193],{"class":976},"\u003C\u003C",[938,1195,1196],{"class":1006}," y ",[938,1198,1193],{"class":976},[938,1200,1201],{"class":1006}," endl",[938,1203,1016],{"class":976},[938,1205,1207],{"class":965,"line":1206},11,[938,1208,1022],{"class":976},[922,1210,1211,1212,1215,1216,1219,1220,1222,1223,1225,1226,1228],{},"这里 3 ~ 5 行定义了刚刚的那个函数 $f$，然后第九行使用了这个函数——令变量 ",[950,1213,1214],{},"y"," 的值为 ",[950,1217,1218],{},"f(x)","。其中 ",[950,1221,1177],{}," 的值为 42，因此 ",[950,1224,1218],{}," 的值为 85。因此 ",[950,1227,1214],{}," 赋值后就得到了 85：",[1230,1231,1232],"io-block",{},[922,1233,1234],{},"85",[922,1236,1237],{},"为了演示，我再举一个二次函数的例子：$g(x)=x^2-4x+1$。那么我可以这样在 C++ 中表示它：",[955,1239,1241],{"className":957,"code":1240,"language":959,"meta":960,"style":960},"int g(int x) {\n    return x * x - 4 * x + 1;\n}\n",[950,1242,1243,1260,1287],{"__ignoreMap":960},[938,1244,1245,1247,1250,1252,1254,1256,1258],{"class":965,"line":966},[938,1246,952],{"class":969},[938,1248,1249],{"class":972}," g",[938,1251,977],{"class":976},[938,1253,952],{"class":969},[938,1255,983],{"class":982},[938,1257,986],{"class":976},[938,1259,989],{"class":976},[938,1261,1262,1264,1266,1269,1271,1274,1277,1279,1281,1283,1285],{"class":965,"line":992},[938,1263,996],{"class":995},[938,1265,1007],{"class":1006},[938,1267,1268],{"class":976},"*",[938,1270,1007],{"class":1006},[938,1272,1273],{"class":976},"-",[938,1275,1276],{"class":999}," 4",[938,1278,1003],{"class":976},[938,1280,1007],{"class":1006},[938,1282,1010],{"class":976},[938,1284,1013],{"class":999},[938,1286,1016],{"class":976},[938,1288,1289],{"class":965,"line":1019},[938,1290,1022],{"class":976},[922,1292,1293],{},"同样地，你可以像刚才那样去使用这个函数。把这段代码放在最上面：",[955,1295,1297],{"className":957,"code":1296,"language":959,"meta":960,"style":960},"#include \u003Ciostream>\nusing namespace std;\nint g(int x) {\n    return x * x - 4 * x + 1;\n}\nint main() {\n    int x, y;\n    cin >> x;\n    y = g(x); \u002F\u002F 使用刚才的函数 g(x)\n    cout \u003C\u003C y \u003C\u003C endl;\n}\n",[950,1298,1299,1309,1319,1335,1359,1363,1373,1386,1398,1415,1429],{"__ignoreMap":960},[938,1300,1301,1303,1305,1307],{"class":965,"line":966},[938,1302,1054],{"class":995},[938,1304,1057],{"class":976},[938,1306,1061],{"class":1060},[938,1308,1064],{"class":976},[938,1310,1311,1313,1315,1317],{"class":965,"line":992},[938,1312,1069],{"class":999},[938,1314,1072],{"class":969},[938,1316,1076],{"class":1075},[938,1318,1016],{"class":976},[938,1320,1321,1323,1325,1327,1329,1331,1333],{"class":965,"line":1019},[938,1322,952],{"class":969},[938,1324,1249],{"class":972},[938,1326,977],{"class":976},[938,1328,952],{"class":969},[938,1330,983],{"class":982},[938,1332,986],{"class":976},[938,1334,989],{"class":976},[938,1336,1337,1339,1341,1343,1345,1347,1349,1351,1353,1355,1357],{"class":965,"line":1097},[938,1338,996],{"class":995},[938,1340,1007],{"class":1006},[938,1342,1268],{"class":976},[938,1344,1007],{"class":1006},[938,1346,1273],{"class":976},[938,1348,1276],{"class":999},[938,1350,1003],{"class":976},[938,1352,1007],{"class":1006},[938,1354,1010],{"class":976},[938,1356,1013],{"class":999},[938,1358,1016],{"class":976},[938,1360,1361],{"class":965,"line":1114},[938,1362,1022],{"class":976},[938,1364,1365,1367,1369,1371],{"class":965,"line":1119},[938,1366,952],{"class":969},[938,1368,1124],{"class":972},[938,1370,1127],{"class":976},[938,1372,989],{"class":976},[938,1374,1375,1377,1379,1382,1384],{"class":965,"line":1132},[938,1376,1135],{"class":969},[938,1378,983],{"class":1006},[938,1380,1381],{"class":976},",",[938,1383,1154],{"class":1006},[938,1385,1016],{"class":976},[938,1387,1388,1391,1394,1396],{"class":965,"line":1149},[938,1389,1390],{"class":1006},"    cin ",[938,1392,1393],{"class":976},">>",[938,1395,983],{"class":1006},[938,1397,1016],{"class":976},[938,1399,1400,1402,1404,1406,1408,1410,1412],{"class":965,"line":1164},[938,1401,1167],{"class":1006},[938,1403,1170],{"class":976},[938,1405,1249],{"class":972},[938,1407,977],{"class":976},[938,1409,1177],{"class":1006},[938,1411,1180],{"class":976},[938,1413,1414],{"class":1183}," \u002F\u002F 使用刚才的函数 g(x)\n",[938,1416,1417,1419,1421,1423,1425,1427],{"class":965,"line":1187},[938,1418,1190],{"class":1006},[938,1420,1193],{"class":976},[938,1422,1196],{"class":1006},[938,1424,1193],{"class":976},[938,1426,1201],{"class":1006},[938,1428,1016],{"class":976},[938,1430,1431],{"class":965,"line":1206},[938,1432,1022],{"class":976},[922,1434,1435],{},"编译运行的效果是：",[1230,1437,1438],{},[922,1439,1440],{},"¶-5↵\n46",[922,1442,1443,1444,1449],{},"现在来考虑绝对值函数 $\\operatorname{abs}(x)=|x|$。该如何在 C++ 中表示这个函数呢？根据定义：\n$$\\operatorname{abs}(x)=\\begin{cases}\nx,&x\\geqslant0\\\n-x,&x\u003C0\n\\end{cases}$$\n那么我可以用",[1445,1446,1448],"a",{"href":1447},"\u002Fch02\u002Fpart2\u002Fother_operator#%E6%9D%A1%E4%BB%B6%E8%BF%90%E7%AE%97%E7%AC%A6","条件表达式","来写出它的解析式：",[955,1451,1453],{"className":957,"code":1452,"language":959,"meta":960,"style":960},"unsigned int abs(int x) {  \u002F\u002F 陪域设置为 unsigned int，因为绝对值必然是非负的\n    return x >= 0 ? x : -x;\n}\n",[950,1454,1455,1480,1507],{"__ignoreMap":960},[938,1456,1457,1460,1463,1466,1468,1470,1472,1474,1477],{"class":965,"line":966},[938,1458,1459],{"class":969},"unsigned",[938,1461,1462],{"class":969}," int",[938,1464,1465],{"class":972}," abs",[938,1467,977],{"class":976},[938,1469,952],{"class":969},[938,1471,983],{"class":982},[938,1473,986],{"class":976},[938,1475,1476],{"class":976}," {",[938,1478,1479],{"class":1183},"  \u002F\u002F 陪域设置为 unsigned int，因为绝对值必然是非负的\n",[938,1481,1482,1484,1486,1489,1492,1495,1497,1500,1503,1505],{"class":965,"line":992},[938,1483,996],{"class":995},[938,1485,1007],{"class":1006},[938,1487,1488],{"class":976},">=",[938,1490,1491],{"class":999}," 0",[938,1493,1494],{"class":976}," ?",[938,1496,1007],{"class":1006},[938,1498,1499],{"class":976},":",[938,1501,1502],{"class":976}," -",[938,1504,1177],{"class":1006},[938,1506,1016],{"class":976},[938,1508,1509],{"class":965,"line":1019},[938,1510,1022],{"class":976},[922,1512,1513],{},"看上去不错；你也可以像刚才那样试着去使用它。最后来看一看符号函数 $\\operatorname{sgn} x$。它数学上的定义是：\n$$\\operatorname{sgn}x=\\begin{cases}\n1,&x>0\\\n0,&x=0\\\n-1,&x\u003C0\n\\end{cases}$$\n那么同样运用条件表达式——",[955,1515,1517],{"className":957,"code":1516,"language":959,"meta":960,"style":960},"int sgn(int x) {\n    return x > 0 ? 1 : x == 0 ? 0 : -1;\n}\n",[950,1518,1519,1536,1574],{"__ignoreMap":960},[938,1520,1521,1523,1526,1528,1530,1532,1534],{"class":965,"line":966},[938,1522,952],{"class":969},[938,1524,1525],{"class":972}," sgn",[938,1527,977],{"class":976},[938,1529,952],{"class":969},[938,1531,983],{"class":982},[938,1533,986],{"class":976},[938,1535,989],{"class":976},[938,1537,1538,1540,1542,1545,1547,1549,1551,1554,1556,1559,1561,1563,1565,1567,1569,1572],{"class":965,"line":992},[938,1539,996],{"class":995},[938,1541,1007],{"class":1006},[938,1543,1544],{"class":976},">",[938,1546,1491],{"class":999},[938,1548,1494],{"class":976},[938,1550,1013],{"class":999},[938,1552,1553],{"class":976}," :",[938,1555,1007],{"class":1006},[938,1557,1558],{"class":976},"==",[938,1560,1491],{"class":999},[938,1562,1494],{"class":976},[938,1564,1491],{"class":999},[938,1566,1553],{"class":976},[938,1568,1502],{"class":976},[938,1570,1571],{"class":999},"1",[938,1573,1016],{"class":976},[938,1575,1576],{"class":965,"line":1019},[938,1577,1022],{"class":976},[922,1579,1580],{},"停停停。你会发现这样写有点太乱了，对吧。那么其实我们可以把条件表达式改成 if 语句的形式……",[955,1582,1584],{"className":957,"code":1583,"language":959,"meta":960,"style":960},"int sgn(int x) {\n    int y;\n    if (x > 0) {\n        y = 1;\n    } else if (x == 0) {\n        y = 0;\n    } else {\n        y = -1;\n    }\n    return y;\n}\n",[950,1585,1586,1602,1610,1629,1641,1664,1674,1682,1694,1699,1707],{"__ignoreMap":960},[938,1587,1588,1590,1592,1594,1596,1598,1600],{"class":965,"line":966},[938,1589,952],{"class":969},[938,1591,1525],{"class":972},[938,1593,977],{"class":976},[938,1595,952],{"class":969},[938,1597,983],{"class":982},[938,1599,986],{"class":976},[938,1601,989],{"class":976},[938,1603,1604,1606,1608],{"class":965,"line":992},[938,1605,1135],{"class":969},[938,1607,1154],{"class":1006},[938,1609,1016],{"class":976},[938,1611,1612,1615,1618,1621,1623,1625,1627],{"class":965,"line":1019},[938,1613,1614],{"class":995},"    if",[938,1616,1617],{"class":976}," (",[938,1619,1620],{"class":1006},"x ",[938,1622,1544],{"class":976},[938,1624,1491],{"class":999},[938,1626,986],{"class":976},[938,1628,989],{"class":976},[938,1630,1631,1635,1637,1639],{"class":965,"line":1097},[938,1632,1634],{"class":1633},"swJcz","        y ",[938,1636,1170],{"class":976},[938,1638,1013],{"class":999},[938,1640,1016],{"class":976},[938,1642,1643,1646,1649,1652,1654,1656,1658,1660,1662],{"class":965,"line":1114},[938,1644,1645],{"class":976},"    }",[938,1647,1648],{"class":995}," else",[938,1650,1651],{"class":995}," if",[938,1653,1617],{"class":976},[938,1655,1620],{"class":1006},[938,1657,1558],{"class":976},[938,1659,1491],{"class":999},[938,1661,986],{"class":976},[938,1663,989],{"class":976},[938,1665,1666,1668,1670,1672],{"class":965,"line":1119},[938,1667,1634],{"class":1633},[938,1669,1170],{"class":976},[938,1671,1491],{"class":999},[938,1673,1016],{"class":976},[938,1675,1676,1678,1680],{"class":965,"line":1132},[938,1677,1645],{"class":976},[938,1679,1648],{"class":995},[938,1681,989],{"class":976},[938,1683,1684,1686,1688,1690,1692],{"class":965,"line":1149},[938,1685,1634],{"class":1633},[938,1687,1170],{"class":976},[938,1689,1502],{"class":976},[938,1691,1571],{"class":999},[938,1693,1016],{"class":976},[938,1695,1696],{"class":965,"line":1164},[938,1697,1698],{"class":976},"    }\n",[938,1700,1701,1703,1705],{"class":965,"line":1187},[938,1702,996],{"class":995},[938,1704,1154],{"class":1006},[938,1706,1016],{"class":976},[938,1708,1709],{"class":965,"line":1206},[938,1710,1022],{"class":976},[922,1712,1713,1714,1716,1717,1719,1720,1722,1723,1725,1726,1729,1730,1732,1733,1735],{},"就像我们原来写代码那样。先设置一个变量 ",[950,1715,1214],{}," 用于存放整个函数计算出来的值，随后根据不同的 ",[950,1718,1177],{}," 判断 ",[950,1721,1214],{}," 应该赋什么值。这时，变量 ",[950,1724,1214],{}," 的值就代表了 ",[950,1727,1728],{},"sgn(x)"," 这个函数应该是多少（相当于原来解析式的作用），因此只要把 ",[950,1731,1214],{}," 放在 ",[950,1734,1036],{}," 后面就好。",[922,1737,1738,1739,1743],{},"上面的代码中，我们在第 2 行到第 9 行",[1740,1741,1742],"strong",{},"以 C++ 语言的形式实现了函数的对应法则","。",[918,1745,1746],{"id":1746},"多元函数",[922,1748,1749],{},"数学上有一种函数叫多元函数。多元函数是指将有序数组 $(x_1,x_2,\\cdots,x_n)$ 通过某个对应规则 $f$ 映射到唯一对应的数 $y$ 上，记作\n$$y=f(x_1,x_2,\\cdots,x_n)$$",[929,1751,1752],{},[922,1753,1754],{},"多元函数的准确定义需要用到笛卡尔积的概念，然而这里为了避免晦涩难懂的词汇从而不展开讲解。",[922,1756,1757],{},"最常见的多元函数就是最大值函数 $\\max$ 了。比如 $\\max{x_1,x_2,\\cdots,x_n}$ 就是取 $x_1,x_2,\\cdots,x_n$ 这些变元中最大的那个。",[922,1759,1760],{},"同样地，C++ 中可以很方便地将多元函数表达出来。用接受两个变元的最大值函数 $\\max{x_1,x_2}$ 举例，我们可以轻松地写出解析式\n$$\\max{x_1,x_2}=\\begin{cases}\nx_1,&x_1>x_2\\\nx_2,&x_1\\leqslant x_2\n\\end{cases}$$\n那么把它用刚刚学过的那个葫芦装起来：",[955,1762,1764],{"className":957,"code":1763,"language":959,"meta":960,"style":960},"int max(int x1, int x2) {\n    return x1 > x2 ? x1 : x2;\n}\n",[950,1765,1766,1791,1814],{"__ignoreMap":960},[938,1767,1768,1770,1773,1775,1777,1780,1782,1784,1787,1789],{"class":965,"line":966},[938,1769,952],{"class":969},[938,1771,1772],{"class":972}," max",[938,1774,977],{"class":976},[938,1776,952],{"class":969},[938,1778,1779],{"class":982}," x1",[938,1781,1381],{"class":976},[938,1783,1462],{"class":969},[938,1785,1786],{"class":982}," x2",[938,1788,986],{"class":976},[938,1790,989],{"class":976},[938,1792,1793,1795,1798,1800,1803,1806,1808,1810,1812],{"class":965,"line":992},[938,1794,996],{"class":995},[938,1796,1797],{"class":1006}," x1 ",[938,1799,1544],{"class":976},[938,1801,1802],{"class":1006}," x2 ",[938,1804,1805],{"class":976},"?",[938,1807,1797],{"class":1006},[938,1809,1499],{"class":976},[938,1811,1786],{"class":1006},[938,1813,1016],{"class":976},[938,1815,1816],{"class":965,"line":1019},[938,1817,1022],{"class":976},[922,1819,1820],{},"当然你也可以用语句来代替条件表达式：",[955,1822,1824],{"className":957,"code":1823,"language":959,"meta":960,"style":960},"int 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}\n",[950,1825,1826,1848,1856,1873,1883,1891,1901,1905,1913],{"__ignoreMap":960},[938,1827,1828,1830,1832,1834,1836,1838,1840,1842,1844,1846],{"class":965,"line":966},[938,1829,952],{"class":969},[938,1831,1772],{"class":972},[938,1833,977],{"class":976},[938,1835,952],{"class":969},[938,1837,1779],{"class":982},[938,1839,1381],{"class":976},[938,1841,1462],{"class":969},[938,1843,1786],{"class":982},[938,1845,986],{"class":976},[938,1847,989],{"class":976},[938,1849,1850,1852,1854],{"class":965,"line":992},[938,1851,1135],{"class":969},[938,1853,1154],{"class":1006},[938,1855,1016],{"class":976},[938,1857,1858,1860,1862,1865,1867,1869,1871],{"class":965,"line":1019},[938,1859,1614],{"class":995},[938,1861,1617],{"class":976},[938,1863,1864],{"class":1006},"x1 ",[938,1866,1544],{"class":976},[938,1868,1786],{"class":1006},[938,1870,986],{"class":976},[938,1872,989],{"class":976},[938,1874,1875,1877,1879,1881],{"class":965,"line":1097},[938,1876,1634],{"class":1633},[938,1878,1170],{"class":976},[938,1880,1779],{"class":1633},[938,1882,1016],{"class":976},[938,1884,1885,1887,1889],{"class":965,"line":1114},[938,1886,1645],{"class":976},[938,1888,1648],{"class":995},[938,1890,989],{"class":976},[938,1892,1893,1895,1897,1899],{"class":965,"line":1119},[938,1894,1634],{"class":1633},[938,1896,1170],{"class":976},[938,1898,1786],{"class":1633},[938,1900,1016],{"class":976},[938,1902,1903],{"class":965,"line":1132},[938,1904,1698],{"class":976},[938,1906,1907,1909,1911],{"class":965,"line":1149},[938,1908,996],{"class":995},[938,1910,1154],{"class":1006},[938,1912,1016],{"class":976},[938,1914,1915],{"class":965,"line":1164},[938,1916,1022],{"class":976},[922,1918,1919],{},"然后你就可以这样去使用这个多元函数：",[955,1921,1923],{"className":957,"code":1922,"language":959,"meta":960,"style":960},"#include \u003Ciostream>\nusing namespace std;\nint max(int x1, int x2) {\n    return x1 > x2 ? x1 : x2;\n}\nint main() {\n    int a, b;\n    cin >> a >> b;\n    cout \u003C\u003C max(a, b) \u003C\u003C endl;\n}\n",[950,1924,1925,1935,1945,1967,1987,1991,2001,2015,2030,2055],{"__ignoreMap":960},[938,1926,1927,1929,1931,1933],{"class":965,"line":966},[938,1928,1054],{"class":995},[938,1930,1057],{"class":976},[938,1932,1061],{"class":1060},[938,1934,1064],{"class":976},[938,1936,1937,1939,1941,1943],{"class":965,"line":992},[938,1938,1069],{"class":999},[938,1940,1072],{"class":969},[938,1942,1076],{"class":1075},[938,1944,1016],{"class":976},[938,1946,1947,1949,1951,1953,1955,1957,1959,1961,1963,1965],{"class":965,"line":1019},[938,1948,952],{"class":969},[938,1950,1772],{"class":972},[938,1952,977],{"class":976},[938,1954,952],{"class":969},[938,1956,1779],{"class":982},[938,1958,1381],{"class":976},[938,1960,1462],{"class":969},[938,1962,1786],{"class":982},[938,1964,986],{"class":976},[938,1966,989],{"class":976},[938,1968,1969,1971,1973,1975,1977,1979,1981,1983,1985],{"class":965,"line":1097},[938,1970,996],{"class":995},[938,1972,1797],{"class":1006},[938,1974,1544],{"class":976},[938,1976,1802],{"class":1006},[938,1978,1805],{"class":976},[938,1980,1797],{"class":1006},[938,1982,1499],{"class":976},[938,1984,1786],{"class":1006},[938,1986,1016],{"class":976},[938,1988,1989],{"class":965,"line":1114},[938,1990,1022],{"class":976},[938,1992,1993,1995,1997,1999],{"class":965,"line":1119},[938,1994,952],{"class":969},[938,1996,1124],{"class":972},[938,1998,1127],{"class":976},[938,2000,989],{"class":976},[938,2002,2003,2005,2008,2010,2013],{"class":965,"line":1132},[938,2004,1135],{"class":969},[938,2006,2007],{"class":1006}," a",[938,2009,1381],{"class":976},[938,2011,2012],{"class":1006}," b",[938,2014,1016],{"class":976},[938,2016,2017,2019,2021,2024,2026,2028],{"class":965,"line":1149},[938,2018,1390],{"class":1006},[938,2020,1393],{"class":976},[938,2022,2023],{"class":1006}," a ",[938,2025,1393],{"class":976},[938,2027,2012],{"class":1006},[938,2029,1016],{"class":976},[938,2031,2032,2034,2036,2038,2040,2042,2044,2046,2048,2051,2053],{"class":965,"line":1164},[938,2033,1190],{"class":1006},[938,2035,1193],{"class":976},[938,2037,1772],{"class":972},[938,2039,977],{"class":976},[938,2041,1445],{"class":1006},[938,2043,1381],{"class":976},[938,2045,2012],{"class":1006},[938,2047,986],{"class":976},[938,2049,2050],{"class":976}," \u003C\u003C",[938,2052,1201],{"class":1006},[938,2054,1016],{"class":976},[938,2056,2057],{"class":965,"line":1187},[938,2058,1022],{"class":976},[922,2060,2061],{},"这段程序会输出输入的两个数之中较大的那个。",[922,2063,2064,2065,2068],{},"不管怎么说，目前你知道 C++ 有一种神奇的写法可以表达出一个数学上简单的函数或者多元函数。当这个函数表达出来之后，你可以用一种很直接的方式（比如 ",[950,2066,2067],{},"y = f(x)","）去使用它。那么这就是你对 C++ 中函数的初步认识。",[922,2070,2071],{},"直到现在我们仍然没有给出 C++ 中函数的具体定义。下一节中我们将进行更详细的学习。",[2073,2074,2075],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .s7zQu, html code.shiki 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.sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":960,"searchDepth":966,"depth":992,"links":2077},[2078,2079,2080],{"id":920,"depth":992,"text":920},{"id":944,"depth":992,"text":945},{"id":1746,"depth":992,"text":1746},"数学上的函数读者应当都有所了解。我们先陈述一下数学上函数的定义","md",null,{},{"icon":232},{"title":252,"description":2081},"Iz74To1Oms9uzzisqcsI4EeArvKYwpaKM_0Nlz4WNwo",[2089,2090],{"title":248,"path":249,"stem":250,"description":248,"icon":232,"children":-1},{"title":256,"path":257,"stem":258,"description":256,"icon":232,"children":-1},1784618094283]