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int",[933,1108,1109],{"class":982}," number",[933,1111,992],{"class":972},[933,1113,1114,1117,1120,1123,1126],{"class":960,"line":995},[933,1115,1116],{"class":964},"    char",[933,1118,1119],{"class":1052}," name",[933,1121,1122],{"class":972},"[",[933,1124,1125],{"class":1006},"30",[933,1127,1128],{"class":972},"];\n",[933,1130,1131],{"class":960,"line":1013},[933,1132,1010],{"class":972},[933,1134,1136,1139,1141,1144,1146,1149,1153,1156],{"class":960,"line":1135},5,[933,1137,1138],{"class":1052},"Student bob",[933,1140,1003],{"class":972},[933,1142,1143],{"class":1006},"12345",[933,1145,986],{"class":972},[933,1147,1148],{"class":972}," \"",[933,1150,1152],{"class":1151},"sfazB","Bob",[933,1154,1155],{"class":972},"\"",[933,1157,1010],{"class":972},[918,1159,1160,1161,1065,1164,1167,1168,1170,1171,1174,1175,1178],{},"这时，",[941,1162,1163],{},"bob",[941,1165,1166],{},"number"," 成员被初始化为 ",[941,1169,1143],{},"，而 ",[941,1172,1173],{},"name"," 成员则被初始化为 ",[941,1176,1177],{},"\"Bob\"","。",[1180,1181,1182],"blockquote",{},[918,1183,1184],{},"这是聚合初始化。能够使用聚合初始化的前提是没有显式给出的构造函数；然而在面向对象编程中这很罕见。所以在之后的学习中我们可能很少使用聚合初始化。",[1186,1187,1188],"h2",{"id":1188},"结构体的声明",[918,1190,1191],{},"你也可以只声明而不定义结构体：",[950,1193,1195],{"className":952,"code":1194,"language":954,"meta":955,"style":955},"struct Student;\n",[941,1196,1197],{"__ignoreMap":955},[933,1198,1199,1201,1203],{"class":960,"line":961},[933,1200,965],{"class":964},[933,1202,1096],{"class":968},[933,1204,992],{"class":972},[1079,1206],{"id":1207},"idx_不完整类型",[918,1209,1210,1211,1214,1215,1218],{},"即不写出成员列表。像这种只声明却没有定义的结构体类型是",[922,1212,1213],{},"不完整类型","（Incomplete type），而不完整类型是没有办法直接用的（因为没有定义）——即 ",[941,1216,1217],{},"A sth;"," 是报编译错误的。",[1186,1220,1221],{"id":1221},"注意事项",[918,1223,1224],{},"我在这里建议读者，将结构体的定义写在全局作用域内。即：",[950,1226,1228],{"className":952,"code":1227,"language":954,"meta":955,"style":955},"#include \u003Ciostream>\nusing namespace std;\nstruct Student {\n    unsigned int number;\n    char name[30];\n};\nint main() {\n    Student bob{12345, \"Bob\"};\n    cout \u003C\u003C bob.name \u003C\u003C endl;\n}\n",[941,1229,1230,1245,1258,1266,1276,1288,1293,1307,1327,1352],{"__ignoreMap":955},[933,1231,1232,1236,1239,1242],{"class":960,"line":961},[933,1233,1235],{"class":1234},"s7zQu","#include",[933,1237,1238],{"class":972}," \u003C",[933,1240,1241],{"class":1151},"iostream",[933,1243,1244],{"class":972},">\n",[933,1246,1247,1250,1253,1256],{"class":960,"line":976},[933,1248,1249],{"class":1006},"using",[933,1251,1252],{"class":964}," namespace",[933,1254,1255],{"class":968}," std",[933,1257,992],{"class":972},[933,1259,1260,1262,1264],{"class":960,"line":995},[933,1261,965],{"class":964},[933,1263,1096],{"class":968},[933,1265,973],{"class":972},[933,1267,1268,1270,1272,1274],{"class":960,"line":1013},[933,1269,1103],{"class":964},[933,1271,1106],{"class":964},[933,1273,1109],{"class":982},[933,1275,992],{"class":972},[933,1277,1278,1280,1282,1284,1286],{"class":960,"line":1135},[933,1279,1116],{"class":964},[933,1281,1119],{"class":1052},[933,1283,1122],{"class":972},[933,1285,1125],{"class":1006},[933,1287,1128],{"class":972},[933,1289,1291],{"class":960,"line":1290},6,[933,1292,1010],{"class":972},[933,1294,1296,1298,1302,1305],{"class":960,"line":1295},7,[933,1297,1041],{"class":964},[933,1299,1301],{"class":1300},"s2Zo4"," main",[933,1303,1304],{"class":972},"()",[933,1306,973],{"class":972},[933,1308,1310,1313,1315,1317,1319,1321,1323,1325],{"class":960,"line":1309},8,[933,1311,1312],{"class":1052},"    Student bob",[933,1314,1003],{"class":972},[933,1316,1143],{"class":1006},[933,1318,986],{"class":972},[933,1320,1148],{"class":972},[933,1322,1152],{"class":1151},[933,1324,1155],{"class":972},[933,1326,1010],{"class":972},[933,1328,1330,1333,1336,1339,1342,1345,1347,1350],{"class":960,"line":1329},9,[933,1331,1332],{"class":1052},"    cout ",[933,1334,1335],{"class":972},"\u003C\u003C",[933,1337,1338],{"class":1052}," bob",[933,1340,1341],{"class":972},".",[933,1343,1344],{"class":1052},"name ",[933,1346,1335],{"class":972},[933,1348,1349],{"class":1052}," endl",[933,1351,992],{"class":972},[933,1353,1355],{"class":960,"line":1354},10,[933,1356,1357],{"class":972},"}\n",[918,1359,1360],{},"这样做的原因是，我们可以在所有的函数中使用这个结构体类型：",[950,1362,1364],{"className":952,"code":1363,"language":954,"meta":955,"style":955},"#include \u003Ciostream>\nusing namespace std;\nstruct Student {\n    unsigned int number;\n    char name[30];\n};\nvoid printName(Student student) {\n    cout \u003C\u003C student.name \u003C\u003C endl;\n}\nint main() {\n    Student bob{12345, \"Bob\"};\n    printName(bob);\n}\n",[941,1365,1366,1376,1386,1394,1404,1416,1420,1443,1461,1465,1475,1494,1507],{"__ignoreMap":955},[933,1367,1368,1370,1372,1374],{"class":960,"line":961},[933,1369,1235],{"class":1234},[933,1371,1238],{"class":972},[933,1373,1241],{"class":1151},[933,1375,1244],{"class":972},[933,1377,1378,1380,1382,1384],{"class":960,"line":976},[933,1379,1249],{"class":1006},[933,1381,1252],{"class":964},[933,1383,1255],{"class":968},[933,1385,992],{"class":972},[933,1387,1388,1390,1392],{"class":960,"line":995},[933,1389,965],{"class":964},[933,1391,1096],{"class":968},[933,1393,973],{"class":972},[933,1395,1396,1398,1400,1402],{"class":960,"line":1013},[933,1397,1103],{"class":964},[933,1399,1106],{"class":964},[933,1401,1109],{"class":982},[933,1403,992],{"class":972},[933,1405,1406,1408,1410,1412,1414],{"class":960,"line":1135},[933,1407,1116],{"class":964},[933,1409,1119],{"class":1052},[933,1411,1122],{"class":972},[933,1413,1125],{"class":1006},[933,1415,1128],{"class":972},[933,1417,1418],{"class":960,"line":1290},[933,1419,1010],{"class":972},[933,1421,1422,1425,1428,1431,1434,1438,1441],{"class":960,"line":1295},[933,1423,1424],{"class":964},"void",[933,1426,1427],{"class":1300}," printName",[933,1429,1430],{"class":972},"(",[933,1432,1433],{"class":968},"Student",[933,1435,1437],{"class":1436},"sHdIc"," student",[933,1439,1440],{"class":972},")",[933,1442,973],{"class":972},[933,1444,1445,1447,1449,1451,1453,1455,1457,1459],{"class":960,"line":1309},[933,1446,1332],{"class":1052},[933,1448,1335],{"class":972},[933,1450,1437],{"class":1052},[933,1452,1341],{"class":972},[933,1454,1344],{"class":1052},[933,1456,1335],{"class":972},[933,1458,1349],{"class":1052},[933,1460,992],{"class":972},[933,1462,1463],{"class":960,"line":1329},[933,1464,1357],{"class":972},[933,1466,1467,1469,1471,1473],{"class":960,"line":1354},[933,1468,1041],{"class":964},[933,1470,1301],{"class":1300},[933,1472,1304],{"class":972},[933,1474,973],{"class":972},[933,1476,1478,1480,1482,1484,1486,1488,1490,1492],{"class":960,"line":1477},11,[933,1479,1312],{"class":1052},[933,1481,1003],{"class":972},[933,1483,1143],{"class":1006},[933,1485,986],{"class":972},[933,1487,1148],{"class":972},[933,1489,1152],{"class":1151},[933,1491,1155],{"class":972},[933,1493,1010],{"class":972},[933,1495,1497,1500,1502,1504],{"class":960,"line":1496},12,[933,1498,1499],{"class":1300},"    printName",[933,1501,1430],{"class":972},[933,1503,1163],{"class":1052},[933,1505,1506],{"class":972},");\n",[933,1508,1510],{"class":960,"line":1509},13,[933,1511,1357],{"class":972},[1180,1513,1514],{},[918,1515,1516],{},"定义在函数内的结构体称为“局部类”（Local class），有一定的语法限制且并不常用。",[1518,1519,1520],"style",{},"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 .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 .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 .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}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}",{"title":955,"searchDepth":961,"depth":976,"links":1522},[1523,1524],{"id":1188,"depth":976,"text":1188},{"id":1221,"depth":976,"text":1221},"结构体是由若干个数据“合起来”组成的一种新类型。","md",null,{},{"icon":398},{"title":400,"description":1525},"FpeesC3sqwedNTQj5FY8x8qY0LaV43k-KbVFWS3n0Bs",[1533,1534],{"title":393,"path":394,"stem":395,"description":393,"icon":398,"children":-1},{"title":404,"path":405,"stem":406,"description":1535,"icon":398,"children":-1},"访问一个结构体的成员需要通过成员运算符 . 来实现",1784618127648]