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这个例子来详细解释简单的变量声明语句的组成。",[918,992,993],{"id":993},"类型说明符",[922,995,996,997,999,1000,1002],{},"一上来开头的 ",[959,998,968],{}," 叫做类型说明符（Type specifier），它指示声明变量的类型。我们已经知道了 ",[959,1001,968],{}," 代表变量的类型是整数类型。除此之外还有一些类型和它们的类型说明符目前你稍微了解即可：",[1004,1005,1006,1021],"ul",{},[1007,1008,1009,1012,1013,1016,1017,1020],"li",{},[959,1010,1011],{},"double"," 表示一个小数类型，可以存储一个小数如 ",[959,1014,1015],{},"3.14"," ",[959,1018,1019],{},"5.21"," ；",[1007,1022,1023,1026,1027,1030,1031,1016,1034,1016,1037,1040,1041,1016,1044,1016,1047,1050,1051,1016,1054,1057,1058,1061],{},[959,1024,1025],{},"char"," 表示一个字符类型（",[925,1028,1029],{},"Char","acter type)，它可以存储一个字符。（字符就是一个英文字母之类的东西，比如 ",[959,1032,1033],{},"'a'",[959,1035,1036],{},"'D'",[959,1038,1039],{},"'h'"," 等；也可以是一部分符号如 ",[959,1042,1043],{},"'?'",[959,1045,1046],{},"'='",[959,1048,1049],{},"'&'"," ；甚至还可以是数字 ",[959,1052,1053],{},"'0'",[959,1055,1056],{},"'1'"," …… ",[959,1059,1060],{},"'9'"," 。（数字不是数。））你会注意到表示字符的时候需要用单引号括起来。",[922,1063,1064,1065,1067],{},"其余的类型我们会在本章的后续内容中介绍，因此刚才所述的这两种类型只需简单了解就够了。所以说，当类型说明符为 ",[959,1066,1011],{}," 时，就表示目前声明并定义的变量是一个小数类型。",[929,1069,1070],{},[922,1071,1072,1073,1075],{},"“小数类型”一词是为了便于理解，它的真实名称叫“双精度浮点型”，也就是类型说明符中 ",[959,1074,1011],{}," 的含义。",[918,1077,1078],{"id":1078},"变量名",[922,1080,1081,1082,1084,1085,1088],{},"在 ",[959,1083,989],{}," 这个例子中，",[959,1086,1087],{},"a"," 叫做变量名，我们已经很熟悉了。在这里我们将介绍变量名的命名规则。",[922,1090,1091,1092,1095,1096,1099,1100,1103,1104,1107,1108,1111],{},"大部分情况下，变量名是由英文字母 ",[959,1093,1094],{},"a...z,A...Z"," 、数字 ",[959,1097,1098],{},"0...9"," 和下划线 ",[959,1101,1102],{},"_"," 组成的文本序列；其中这个序列的第一个字符",[925,1105,1106],{},"不能是数字","，同时整个变量名",[925,1109,1110],{},"不得与关键字相同","。",[929,1113,1114],{},[922,1115,1116],{},"变量名是标识符（Identifier）的一种表现。上文所述的规则实际上是标识符的规则。",[922,1118,1119,1120,1016,1122,1016,1125,1016,1128,1016,1131,1016,1134,1137,1138,1016,1141,1016,1144,1016,1147,1150,1151,1154,1155,1158,1159,1162,1163,1016,1166,1016,1169,1172,1173,1111],{},"那么类似 ",[959,1121,1087],{},[959,1123,1124],{},"b",[959,1126,1127],{},"c",[959,1129,1130],{},"sum",[959,1132,1133],{},"average",[959,1135,1136],{},"total"," 等等，都是正确的（指可以使用的，有时也叫作合法的）变量名。包含数字或者下划线的如 ",[959,1139,1140],{},"x1",[959,1142,1143],{},"a123",[959,1145,1146],{},"zhang_san",[959,1148,1149],{},"zhang_3"," 也是没有问题的。但是 ",[959,1152,1153],{},"3zhang"," 是没法用的，因为数字不能出现在第一个字符上。除了数字、英文字母和下划线之外的字符一般不能用于变量名中。比如 ",[959,1156,1157],{},"test#1"," 不能用作变量名，因为 ",[959,1160,1161],{},"#"," 这个符号不是数字、字母或下划线。同理， ",[959,1164,1165],{},"$123",[959,1167,1168],{},"Mc.Dowell",[959,1170,1171],{},"set-minus"," 之类的也都包含那些不能用作变量名的字符。除此之外，我",[925,1174,1175],{},"不推荐使用下划线开头的命名",[929,1177,1178],{},[922,1179,1180],{},"不推荐的原因是可能会与标准库具体实现中的命名冲突；这些命名均为双下划线开头或者下划线+大写字母的方式开头。",[922,1182,1183],{},"最后一句“不得与关键字相同”是什么意思呢？关键字指的是在 C++ 程序中有特殊意义的单词。比如我们目前遇到的关键字有：",[1004,1185,1186,1197,1203,1209],{},[1007,1187,1188,1190,1191,1193,1194,1196],{},[959,1189,968],{}," ，它的含义是声明并定义整数类型；类似的 ",[959,1192,1011],{}," 和 ",[959,1195,1025],{}," 也是关键字；",[1007,1198,1199,1202],{},[959,1200,1201],{},"if"," ，它的含义是引入分支；",[1007,1204,1205,1208],{},[959,1206,1207],{},"else"," ，它的含义是引入分支的“否则”部分；",[1007,1210,1211,1214],{},[959,1212,1213],{},"while"," ，它的含义是引入循环。",[922,1216,1217],{},"正因为这些词有着如上所述的特殊意义，所以不能把它们用作变量名。C++ 至今包括 97 个关键词。为了方便参考，我将它们罗列在下面：",[1219,1220,1221,1236],"table",{},[1222,1223,1224],"thead",{},[1225,1226,1227,1230,1232,1234],"tr",{},[1228,1229],"th",{},[1228,1231],{},[1228,1233],{},[1228,1235],{},[1237,1238,1239,1262,1284,1306,1328,1350,1372,1394,1416,1438,1460,1481,1503,1524,1546,1568,1589,1611,1633,1655,1676,1698,1720,1738,1757],"tbody",{},[1225,1240,1241,1247,1252,1257],{},[1242,1243,1244],"td",{},[959,1245,1246],{},"alignas",[1242,1248,1249],{},[959,1250,1251],{},"constinit",[1242,1253,1254],{},[959,1255,1256],{},"long",[1242,1258,1259],{},[959,1260,1261],{},"struct",[1225,1263,1264,1269,1274,1279],{},[1242,1265,1266],{},[959,1267,1268],{},"alignof",[1242,1270,1271],{},[959,1272,1273],{},"const_cast",[1242,1275,1276],{},[959,1277,1278],{},"mutable",[1242,1280,1281],{},[959,1282,1283],{},"switch",[1225,1285,1286,1291,1296,1301],{},[1242,1287,1288],{},[959,1289,1290],{},"and",[1242,1292,1293],{},[959,1294,1295],{},"continue",[1242,1297,1298],{},[959,1299,1300],{},"namespace",[1242,1302,1303],{},[959,1304,1305],{},"synchronized",[1225,1307,1308,1313,1318,1323],{},[1242,1309,1310],{},[959,1311,1312],{},"and_eq",[1242,1314,1315],{},[959,1316,1317],{},"co_await",[1242,1319,1320],{},[959,1321,1322],{},"new",[1242,1324,1325],{},[959,1326,1327],{},"template",[1225,1329,1330,1335,1340,1345],{},[1242,1331,1332],{},[959,1333,1334],{},"asm",[1242,1336,1337],{},[959,1338,1339],{},"co_return",[1242,1341,1342],{},[959,1343,1344],{},"noexcept",[1242,1346,1347],{},[959,1348,1349],{},"this",[1225,1351,1352,1357,1362,1367],{},[1242,1353,1354],{},[959,1355,1356],{},"atomic_cancel",[1242,1358,1359],{},[959,1360,1361],{},"co_yield",[1242,1363,1364],{},[959,1365,1366],{},"not",[1242,1368,1369],{},[959,1370,1371],{},"thread_local",[1225,1373,1374,1379,1384,1389],{},[1242,1375,1376],{},[959,1377,1378],{},"atomic_commit",[1242,1380,1381],{},[959,1382,1383],{},"decltype",[1242,1385,1386],{},[959,1387,1388],{},"not_eq",[1242,1390,1391],{},[959,1392,1393],{},"throw",[1225,1395,1396,1401,1406,1411],{},[1242,1397,1398],{},[959,1399,1400],{},"atomic_noexcept",[1242,1402,1403],{},[959,1404,1405],{},"default",[1242,1407,1408],{},[959,1409,1410],{},"nullptr",[1242,1412,1413],{},[959,1414,1415],{},"true",[1225,1417,1418,1423,1428,1433],{},[1242,1419,1420],{},[959,1421,1422],{},"auto",[1242,1424,1425],{},[959,1426,1427],{},"delete",[1242,1429,1430],{},[959,1431,1432],{},"operator",[1242,1434,1435],{},[959,1436,1437],{},"try",[1225,1439,1440,1445,1450,1455],{},[1242,1441,1442],{},[959,1443,1444],{},"bitand",[1242,1446,1447],{},[959,1448,1449],{},"do",[1242,1451,1452],{},[959,1453,1454],{},"or",[1242,1456,1457],{},[959,1458,1459],{},"typedef",[1225,1461,1462,1467,1471,1476],{},[1242,1463,1464],{},[959,1465,1466],{},"bitor",[1242,1468,1469],{},[959,1470,1011],{},[1242,1472,1473],{},[959,1474,1475],{},"or_eq",[1242,1477,1478],{},[959,1479,1480],{},"typeid",[1225,1482,1483,1488,1493,1498],{},[1242,1484,1485],{},[959,1486,1487],{},"bool",[1242,1489,1490],{},[959,1491,1492],{},"dynamic_cast",[1242,1494,1495],{},[959,1496,1497],{},"private",[1242,1499,1500],{},[959,1501,1502],{},"typename",[1225,1504,1505,1510,1514,1519],{},[1242,1506,1507],{},[959,1508,1509],{},"break",[1242,1511,1512],{},[959,1513,1207],{},[1242,1515,1516],{},[959,1517,1518],{},"protected",[1242,1520,1521],{},[959,1522,1523],{},"union",[1225,1525,1526,1531,1536,1541],{},[1242,1527,1528],{},[959,1529,1530],{},"case",[1242,1532,1533],{},[959,1534,1535],{},"enum",[1242,1537,1538],{},[959,1539,1540],{},"public",[1242,1542,1543],{},[959,1544,1545],{},"unsigned",[1225,1547,1548,1553,1558,1563],{},[1242,1549,1550],{},[959,1551,1552],{},"catch",[1242,1554,1555],{},[959,1556,1557],{},"explicit",[1242,1559,1560],{},[959,1561,1562],{},"reflexpr",[1242,1564,1565],{},[959,1566,1567],{},"using",[1225,1569,1570,1574,1579,1584],{},[1242,1571,1572],{},[959,1573,1025],{},[1242,1575,1576],{},[959,1577,1578],{},"export",[1242,1580,1581],{},[959,1582,1583],{},"register",[1242,1585,1586],{},[959,1587,1588],{},"virtual",[1225,1590,1591,1596,1601,1606],{},[1242,1592,1593],{},[959,1594,1595],{},"char8_t",[1242,1597,1598],{},[959,1599,1600],{},"extern",[1242,1602,1603],{},[959,1604,1605],{},"reinterpret_cast",[1242,1607,1608],{},[959,1609,1610],{},"void",[1225,1612,1613,1618,1623,1628],{},[1242,1614,1615],{},[959,1616,1617],{},"char16_t",[1242,1619,1620],{},[959,1621,1622],{},"false",[1242,1624,1625],{},[959,1626,1627],{},"requires",[1242,1629,1630],{},[959,1631,1632],{},"volatile",[1225,1634,1635,1640,1645,1650],{},[1242,1636,1637],{},[959,1638,1639],{},"char32_t",[1242,1641,1642],{},[959,1643,1644],{},"float",[1242,1646,1647],{},[959,1648,1649],{},"return",[1242,1651,1652],{},[959,1653,1654],{},"wchar_t",[1225,1656,1657,1662,1667,1672],{},[1242,1658,1659],{},[959,1660,1661],{},"class",[1242,1663,1664],{},[959,1665,1666],{},"for",[1242,1668,1669],{},[959,1670,1671],{},"short",[1242,1673,1674],{},[959,1675,1213],{},[1225,1677,1678,1683,1688,1693],{},[1242,1679,1680],{},[959,1681,1682],{},"compl",[1242,1684,1685],{},[959,1686,1687],{},"friend",[1242,1689,1690],{},[959,1691,1692],{},"signed",[1242,1694,1695],{},[959,1696,1697],{},"xor",[1225,1699,1700,1705,1710,1715],{},[1242,1701,1702],{},[959,1703,1704],{},"concept",[1242,1706,1707],{},[959,1708,1709],{},"goto",[1242,1711,1712],{},[959,1713,1714],{},"sizeof",[1242,1716,1717],{},[959,1718,1719],{},"xor_eq",[1225,1721,1722,1727,1731,1736],{},[1242,1723,1724],{},[959,1725,1726],{},"const",[1242,1728,1729],{},[959,1730,1201],{},[1242,1732,1733],{},[959,1734,1735],{},"static",[1242,1737],{},[1225,1739,1740,1745,1750,1755],{},[1242,1741,1742],{},[959,1743,1744],{},"consteval",[1242,1746,1747],{},[959,1748,1749],{},"inline",[1242,1751,1752],{},[959,1753,1754],{},"static_assert",[1242,1756],{},[1225,1758,1759,1764,1768,1773],{},[1242,1760,1761],{},[959,1762,1763],{},"constexpr",[1242,1765,1766],{},[959,1767,968],{},[1242,1769,1770],{},[959,1771,1772],{},"static_cast",[1242,1774],{},[922,1776,1777,1778,1781],{},"你不用特意地去记住它们。我们常用的只有其中的三十几个，将在本书中慢慢介绍。所有关键字的含义在附录中都会有简单的介绍和使用说明。我在",[1087,1779,5],{"href":1780},"\u002Fappendix\u002Fcoding_style#%E5%91%BD%E5%90%8D","介绍了关于变量命名的一些习惯用法。",[929,1783,1784,1787],{},[922,1785,1786],{},"除此之外还有 6 个叫做保留字的东西。保留字可以被用作变量名，但同时也具有特殊意义。我建议尽量避免变量名与保留字相同。以下是这六个保留字：",[1004,1788,1789,1794,1799,1804,1809,1814],{},[1007,1790,1791],{},[959,1792,1793],{},"override",[1007,1795,1796],{},[959,1797,1798],{},"final",[1007,1800,1801],{},[959,1802,1803],{},"import",[1007,1805,1806],{},[959,1807,1808],{},"module",[1007,1810,1811],{},[959,1812,1813],{},"transaction_safe",[1007,1815,1816],{},[959,1817,1818],{},"transaction_safe_dynamic",[918,1820,946],{"id":946},[922,1822,1823],{},"C++ 中初始化器（Initializer）非常复杂繁琐，但好在我们只需掌握一种（或者两种）就够了。这种初始化器叫做列表初始化器，长成这样：",[938,1825,1826],{},[922,1827,1828,1829,1832],{},"\"{\"",[944,1830,1831],{},"初始化值","\"}\"",[922,1834,1835,1836,1838,1839,1842,1843,1845,1846,1848,1849,1851],{},"用一对大括号围起来，然后里面是初始化值。变量的初始化值的含义是，当这个变量拥有它的存储空间的那一刻，指明这个存储空间应该放什么数据。比如 ",[959,1837,989],{}," 中 ",[959,1840,1841],{},"{42}"," 是初始化器， ",[959,1844,980],{}," 就是初始化值：意思是当 ",[959,1847,1087],{}," 拥有了存储空间之后，就放上 ",[959,1850,980],{}," 这个数。",[929,1853,1854],{},[922,1855,1856,1857,1860,1861,1864,1865,1868,1869,1872],{},"第二种初始化器——直接初始化器 ",[959,1858,1859],{},"@\"(\"参数列表\")\"@","，需要等到",[1087,1862,1863],{"href":424},"面向对象","的时候才会接触到。此外，你可能还经常见到 ",[959,1866,1867],{},"int a = 42;"," 这种写法，也即形如 ",[959,1870,1871],{},"@\"=\" 初始化值@"," 的初始化器。这种写法在目前阶段可以认为和大括号初始化效果一致。",[922,1874,1875,1876,1879],{},"初始化器是",[925,1877,1878],{},"可有可无的","（正式的说法叫可选的（Optional））。也就是说，可以不写初始化器，这个时候对于变量获得的存储空间则不进行任何操作——因此当没有初始化器的时候，无法知道这个变量的值是多少。比如：",[952,1881,1883],{"className":954,"code":1882,"language":956,"meta":957,"style":957},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a;             \u002F\u002F 移除初始化器\n    cout \u003C\u003C a \u003C\u003C endl; \u002F\u002F 输出是不确定的。比如在某些情况下输出“4201998”\n}\n",[959,1884,1885,1901,1916,1931,1946,1968],{"__ignoreMap":957},[944,1886,1887,1891,1894,1898],{"class":963,"line":964},[944,1888,1890],{"class":1889},"s7zQu","#include",[944,1892,1893],{"class":975}," \u003C",[944,1895,1897],{"class":1896},"sfazB","iostream",[944,1899,1900],{"class":975},">\n",[944,1902,1904,1906,1909,1913],{"class":963,"line":1903},2,[944,1905,1567],{"class":979},[944,1907,1908],{"class":967}," namespace",[944,1910,1912],{"class":1911},"sBMFI"," std",[944,1914,1915],{"class":975},";\n",[944,1917,1919,1921,1925,1928],{"class":963,"line":1918},3,[944,1920,968],{"class":967},[944,1922,1924],{"class":1923},"s2Zo4"," main",[944,1926,1927],{"class":975},"()",[944,1929,1930],{"class":975}," {\n",[944,1932,1934,1937,1939,1942],{"class":963,"line":1933},4,[944,1935,1936],{"class":967},"    int",[944,1938,972],{"class":971},[944,1940,1941],{"class":975},";",[944,1943,1945],{"class":1944},"sHwdD","             \u002F\u002F 移除初始化器\n",[944,1947,1949,1952,1955,1958,1960,1963,1965],{"class":963,"line":1948},5,[944,1950,1951],{"class":971},"    cout ",[944,1953,1954],{"class":975},"\u003C\u003C",[944,1956,1957],{"class":971}," a ",[944,1959,1954],{"class":975},[944,1961,1962],{"class":971}," endl",[944,1964,1941],{"class":975},[944,1966,1967],{"class":1944}," \u002F\u002F 输出是不确定的。比如在某些情况下输出“4201998”\n",[944,1969,1971],{"class":963,"line":1970},6,[944,1972,1973],{"class":975},"}\n",[922,1975,1976,1977,1980],{},"因此只在确定这个变量",[925,1978,1979],{},"稍后会被赋值","的情况下才省去初始化器。稍后会被赋值也包含稍后会允许用户输入到这个变量的情形。",[918,1982,93],{"id":93},[922,1984,1985],{},"作为例子，以下列举了一些声明语句，它们的含义也用注释写出：",[952,1987,1989],{"className":954,"code":1988,"language":956,"meta":957,"style":957},"int a{42};             \u002F\u002F 声明并定义 a 为整数类型，它的初始化值为 42\ndouble pi{3.14};       \u002F\u002F 声明并定义 pi 为小数类型，它的初始化值为 3.14\ndouble sqrt2{1.41421}; \u002F\u002F 声明并定义 sqrt2 为小数类型，它的初始化值为 1.41421\nchar letter{'G'};      \u002F\u002F 声明并定义 letter 为字符类型，它的初始化值为字符 'G'。注意单引号的使用\nchar symbol{'@'};      \u002F\u002F 声明并定义 symbol 为字符类型，它的初始化值为字符 '@'\n",[959,1990,1991,2007,2023,2040,2062],{"__ignoreMap":957},[944,1992,1993,1995,1997,1999,2001,2004],{"class":963,"line":964},[944,1994,968],{"class":967},[944,1996,972],{"class":971},[944,1998,976],{"class":975},[944,2000,980],{"class":979},[944,2002,2003],{"class":975},"};",[944,2005,2006],{"class":1944},"             \u002F\u002F 声明并定义 a 为整数类型，它的初始化值为 42\n",[944,2008,2009,2011,2014,2016,2018,2020],{"class":963,"line":1903},[944,2010,1011],{"class":967},[944,2012,2013],{"class":971}," pi",[944,2015,976],{"class":975},[944,2017,1015],{"class":979},[944,2019,2003],{"class":975},[944,2021,2022],{"class":1944},"       \u002F\u002F 声明并定义 pi 为小数类型，它的初始化值为 3.14\n",[944,2024,2025,2027,2030,2032,2035,2037],{"class":963,"line":1918},[944,2026,1011],{"class":967},[944,2028,2029],{"class":971}," sqrt2",[944,2031,976],{"class":975},[944,2033,2034],{"class":979},"1.41421",[944,2036,2003],{"class":975},[944,2038,2039],{"class":1944}," \u002F\u002F 声明并定义 sqrt2 为小数类型，它的初始化值为 1.41421\n",[944,2041,2042,2044,2047,2049,2052,2055,2057,2059],{"class":963,"line":1933},[944,2043,1025],{"class":967},[944,2045,2046],{"class":971}," letter",[944,2048,976],{"class":975},[944,2050,2051],{"class":975},"'",[944,2053,2054],{"class":1896},"G",[944,2056,2051],{"class":975},[944,2058,2003],{"class":975},[944,2060,2061],{"class":1944},"      \u002F\u002F 声明并定义 letter 为字符类型，它的初始化值为字符 'G'。注意单引号的使用\n",[944,2063,2064,2066,2069,2071,2073,2076,2078,2080],{"class":963,"line":1948},[944,2065,1025],{"class":967},[944,2067,2068],{"class":971}," symbol",[944,2070,976],{"class":975},[944,2072,2051],{"class":975},[944,2074,2075],{"class":1896},"@",[944,2077,2051],{"class":975},[944,2079,2003],{"class":975},[944,2081,2082],{"class":1944},"      \u002F\u002F 声明并定义 symbol 为字符类型，它的初始化值为字符 '@'\n",[922,2084,2085,2086,2089],{},"同时，还有一种简化写法：对于相同类型的变量，可以将变量名+初始化器写在同一行，用逗号 ",[959,2087,2088],{},","," 分隔，共用一个类型说明符。比如刚才的声明语句可以简化为：",[952,2091,2093],{"className":954,"code":2092,"language":956,"meta":957,"style":957},"\u002F\u002F 声明并定义 a 为整数类型，它的初始化值为 42；声明并定义 b 也为整数类型，它的初始化值为 56\nint a{42}, b{56};\n\u002F\u002F 下面两个都是 double 类型\ndouble pi{3.14}, sqrt2{1.41421};\n\u002F\u002F 下面两个都是 char 类型\nchar letter{'G'}, symbol{'@'};\n",[959,2094,2095,2100,2123,2128,2148,2153],{"__ignoreMap":957},[944,2096,2097],{"class":963,"line":964},[944,2098,2099],{"class":1944},"\u002F\u002F 声明并定义 a 为整数类型，它的初始化值为 42；声明并定义 b 也为整数类型，它的初始化值为 56\n",[944,2101,2102,2104,2106,2108,2110,2113,2116,2118,2121],{"class":963,"line":1903},[944,2103,968],{"class":967},[944,2105,972],{"class":971},[944,2107,976],{"class":975},[944,2109,980],{"class":979},[944,2111,2112],{"class":975},"},",[944,2114,2115],{"class":971}," b",[944,2117,976],{"class":975},[944,2119,2120],{"class":979},"56",[944,2122,983],{"class":975},[944,2124,2125],{"class":963,"line":1918},[944,2126,2127],{"class":1944},"\u002F\u002F 下面两个都是 double 类型\n",[944,2129,2130,2132,2134,2136,2138,2140,2142,2144,2146],{"class":963,"line":1933},[944,2131,1011],{"class":967},[944,2133,2013],{"class":971},[944,2135,976],{"class":975},[944,2137,1015],{"class":979},[944,2139,2112],{"class":975},[944,2141,2029],{"class":971},[944,2143,976],{"class":975},[944,2145,2034],{"class":979},[944,2147,983],{"class":975},[944,2149,2150],{"class":963,"line":1948},[944,2151,2152],{"class":1944},"\u002F\u002F 下面两个都是 char 类型\n",[944,2154,2155,2157,2159,2161,2163,2165,2167,2169,2171,2173,2175,2177,2179],{"class":963,"line":1970},[944,2156,1025],{"class":967},[944,2158,2046],{"class":971},[944,2160,976],{"class":975},[944,2162,2051],{"class":975},[944,2164,2054],{"class":1896},[944,2166,2051],{"class":975},[944,2168,2112],{"class":975},[944,2170,2068],{"class":971},[944,2172,976],{"class":975},[944,2174,2051],{"class":975},[944,2176,2075],{"class":1896},[944,2178,2051],{"class":975},[944,2180,983],{"class":975},[922,2182,2183],{},"以后我们会经常使用这种简化。",[929,2185,2186],{},[922,2187,2188],{},"这种简化只能用于简单类型。对于复合类型（如指针、数组、函数、引用）来说，这种简化会造成麻烦。",[918,2190,2191],{"id":2191},"练习",[2193,2194,2195,2198],"ol",{},[1007,2196,2197],{},"练习使用声明语句：尝试不同类型、变量名和初始化器。尝试使用同类型声明语句的简化。编译它们来检测是否正确。",[1007,2199,2200,2201,1016,2204,1016,2207,1016,2210,1016,2213,1016,2216,1016,2219,1016,2222,1016,2225,2227],{},"判断以下变量名是否合法： ",[959,2202,2203],{},"3D64",[959,2205,2206],{},"lotus_1_2_3",[959,2208,2209],{},"a>b",[959,2211,2212],{},"McDowell",[959,2214,2215],{},"get3DBuffer",[959,2217,2218],{},"@guyutongxue",[959,2220,2221],{},"Donald Trump",[959,2223,2224],{},"student_name",[959,2226,1661],{}," 。",[918,2229,2230],{"id":2230},"练习参考答案",[922,2232,2233,2234,2237,2238,2240],{},"第二题：否（数字开头），是，否（含符号 ",[959,2235,2236],{},">"," ），是，是，否（含符号 ",[959,2239,2075],{}," ），否（含空格），是，否（与关键字相同）。",[2242,2243,2244],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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);}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 .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .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}",{"title":957,"searchDepth":964,"depth":1903,"links":2246},[2247,2248,2249,2250,2251,2252,2253],{"id":920,"depth":1903,"text":920},{"id":993,"depth":1903,"text":993},{"id":1078,"depth":1903,"text":1078},{"id":946,"depth":1903,"text":946},{"id":93,"depth":1903,"text":93},{"id":2191,"depth":1903,"text":2191},{"id":2230,"depth":1903,"text":2230},"声明语句（Declaration statement）是指执行声明操作的程序片段。","md",null,{},{"icon":105},{"title":119,"description":2254},"NUEW7StsoLG4WI-NYzw2vGIcIXMEgXBNccmCl28kdAM",[2262,2263],{"title":115,"path":116,"stem":117,"description":115,"icon":105,"children":-1},{"title":123,"path":124,"stem":125,"description":123,"icon":105,"children":-1},1784618110813]