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12}","。也就是如下图所示：\n",[1006,1167],{"alt":1008,"src":1168},"https:\u002F\u002Fs1.ax1x.com\u002F2020\u002F08\u002F04\u002FawbajS.png",[918,1170,1171],{},"这种写法和一维数组的初始化没有太多差别，只是将“大括号列表”进行了两层的嵌套而已。所以一位数组的其它初始化方法也大多适用。比如下面的代码提供较少的初始化值，没有提供初始化值的元素仍然被初始化为 0。",[930,1173,1175],{"className":932,"code":1174,"language":934,"meta":935,"style":935},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a[3][4]{\n        {1},\n        {2, 3},\n        {4, 5, 6}\n    };\n    \u002F\u002F 逐个输出 a 中的元素\n    for(int i{0}; i \u003C 3; i++) {\n        for (int j{0}; j \u003C 4; j++) {\n            cout \u003C\u003C a[i][j] \u003C\u003C \" \";\n        }\n        cout \u003C\u003C endl;\n    }\n}\n",[925,1176,1177,1193,1208,1222,1239,1248,1262,1280,1286,1293,1334,1371,1405,1411,1424,1430],{"__ignoreMap":935},[939,1178,1179,1183,1186,1190],{"class":941,"line":942},[939,1180,1182],{"class":1181},"s7zQu","#include",[939,1184,1185],{"class":953}," \u003C",[939,1187,1189],{"class":1188},"sfazB","iostream",[939,1191,1192],{"class":953},">\n",[939,1194,1195,1198,1201,1205],{"class":941,"line":1062},[939,1196,1197],{"class":957},"using",[939,1199,1200],{"class":945}," namespace",[939,1202,1204],{"class":1203},"sBMFI"," std",[939,1206,1207],{"class":953},";\n",[939,1209,1210,1212,1216,1219],{"class":941,"line":1090},[939,1211,946],{"class":945},[939,1213,1215],{"class":1214},"s2Zo4"," main",[939,1217,1218],{"class":953},"()",[939,1220,1221],{"class":953}," {\n",[939,1223,1224,1227,1229,1231,1233,1235,1237],{"class":941,"line":1115},[939,1225,1226],{"class":945},"    int",[939,1228,950],{"class":949},[939,1230,954],{"class":953},[939,1232,958],{"class":957},[939,1234,961],{"class":953},[939,1236,964],{"class":957},[939,1238,1059],{"class":953},[939,1240,1241,1244,1246],{"class":941,"line":1141},[939,1242,1243],{"class":953},"        {",[939,1245,1068],{"class":957},[939,1247,1087],{"class":953},[939,1249,1251,1253,1256,1258,1260],{"class":941,"line":1250},6,[939,1252,1243],{"class":953},[939,1254,1255],{"class":957},"2",[939,1257,1071],{"class":953},[939,1259,1079],{"class":957},[939,1261,1087],{"class":953},[939,1263,1265,1267,1269,1271,1274,1276,1278],{"class":941,"line":1264},7,[939,1266,1243],{"class":953},[939,1268,964],{"class":957},[939,1270,1071],{"class":953},[939,1272,1273],{"class":957}," 5",[939,1275,1071],{"class":953},[939,1277,1100],{"class":957},[939,1279,1138],{"class":953},[939,1281,1283],{"class":941,"line":1282},8,[939,1284,1285],{"class":953},"    };\n",[939,1287,1289],{"class":941,"line":1288},9,[939,1290,1292],{"class":1291},"sHwdD","    \u002F\u002F 逐个输出 a 中的元素\n",[939,1294,1296,1299,1302,1304,1307,1310,1313,1316,1319,1322,1324,1326,1329,1332],{"class":941,"line":1295},10,[939,1297,1298],{"class":1181},"    for",[939,1300,1301],{"class":953},"(",[939,1303,946],{"class":945},[939,1305,1306],{"class":949}," i{",[939,1308,1309],{"class":957},"0",[939,1311,1312],{"class":949},"}",[939,1314,1315],{"class":953},";",[939,1317,1318],{"class":949}," i ",[939,1320,1321],{"class":953},"\u003C",[939,1323,1079],{"class":957},[939,1325,1315],{"class":953},[939,1327,1328],{"class":949}," i",[939,1330,1331],{"class":953},"++)",[939,1333,1221],{"class":953},[939,1335,1337,1340,1343,1345,1349,1351,1353,1355,1358,1360,1362,1364,1367,1369],{"class":941,"line":1336},11,[939,1338,1339],{"class":1181},"        for",[939,1341,1342],{"class":953}," (",[939,1344,946],{"class":945},[939,1346,1348],{"class":1347},"swJcz"," j{",[939,1350,1309],{"class":957},[939,1352,1312],{"class":1347},[939,1354,1315],{"class":953},[939,1356,1357],{"class":1347}," j ",[939,1359,1321],{"class":953},[939,1361,1084],{"class":957},[939,1363,1315],{"class":953},[939,1365,1366],{"class":1347}," j",[939,1368,1331],{"class":953},[939,1370,1221],{"class":953},[939,1372,1374,1377,1380,1382,1384,1387,1389,1392,1395,1398,1401,1403],{"class":941,"line":1373},12,[939,1375,1376],{"class":1347},"            cout ",[939,1378,1379],{"class":953},"\u003C\u003C",[939,1381,950],{"class":949},[939,1383,954],{"class":953},[939,1385,1386],{"class":1347},"i",[939,1388,961],{"class":953},[939,1390,1391],{"class":1347},"j",[939,1393,1394],{"class":953},"]",[939,1396,1397],{"class":953}," \u003C\u003C",[939,1399,1400],{"class":953}," \"",[939,1402,1400],{"class":953},[939,1404,1207],{"class":953},[939,1406,1408],{"class":941,"line":1407},13,[939,1409,1410],{"class":953},"        }\n",[939,1412,1414,1417,1419,1422],{"class":941,"line":1413},14,[939,1415,1416],{"class":1347},"        cout ",[939,1418,1379],{"class":953},[939,1420,1421],{"class":1347}," endl",[939,1423,1207],{"class":953},[939,1425,1427],{"class":941,"line":1426},15,[939,1428,1429],{"class":953},"    }\n",[939,1431,1433],{"class":941,"line":1432},16,[939,1434,1138],{"class":953},[918,1436,1437],{},"它的运行结果是：",[1439,1440,1441],"io-block",{},[918,1442,1443],{},"1 0 0 0\n2 3 0 0\n4 5 6 0",[918,1445,1446,1447,1449,1450,1452,1453,1455],{},"你还可以这样初始化：不给 ",[925,1448,984],{}," 这个数组提供初始化器，也就是只初始化了 ",[925,1451,977],{}," 和 ",[925,1454,981],{},"。",[930,1457,1459],{"className":932,"code":1458,"language":934,"meta":935,"style":935},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a[3][4]{\n        {1, 2, 3, 4},\n        {5, 6, 7, 8}\n    };\n    \u002F\u002F 逐个输出 a 中的元素\n    for(int i{0}; i \u003C 3; i++) {\n        for (int j{0}; j \u003C 4; j++) {\n            cout \u003C\u003C a[i][j] \u003C\u003C \" \";\n        }\n        cout \u003C\u003C endl;\n    }\n}\n",[925,1460,1461,1471,1481,1491,1507,1527,1547,1551,1555,1585,1615,1641,1645,1655,1659],{"__ignoreMap":935},[939,1462,1463,1465,1467,1469],{"class":941,"line":942},[939,1464,1182],{"class":1181},[939,1466,1185],{"class":953},[939,1468,1189],{"class":1188},[939,1470,1192],{"class":953},[939,1472,1473,1475,1477,1479],{"class":941,"line":1062},[939,1474,1197],{"class":957},[939,1476,1200],{"class":945},[939,1478,1204],{"class":1203},[939,1480,1207],{"class":953},[939,1482,1483,1485,1487,1489],{"class":941,"line":1090},[939,1484,946],{"class":945},[939,1486,1215],{"class":1214},[939,1488,1218],{"class":953},[939,1490,1221],{"class":953},[939,1492,1493,1495,1497,1499,1501,1503,1505],{"class":941,"line":1115},[939,1494,1226],{"class":945},[939,1496,950],{"class":949},[939,1498,954],{"class":953},[939,1500,958],{"class":957},[939,1502,961],{"class":953},[939,1504,964],{"class":957},[939,1506,1059],{"class":953},[939,1508,1509,1511,1513,1515,1517,1519,1521,1523,1525],{"class":941,"line":1141},[939,1510,1243],{"class":953},[939,1512,1068],{"class":957},[939,1514,1071],{"class":953},[939,1516,1074],{"class":957},[939,1518,1071],{"class":953},[939,1520,1079],{"class":957},[939,1522,1071],{"class":953},[939,1524,1084],{"class":957},[939,1526,1087],{"class":953},[939,1528,1529,1531,1533,1535,1537,1539,1541,1543,1545],{"class":941,"line":1250},[939,1530,1243],{"class":953},[939,1532,1095],{"class":957},[939,1534,1071],{"class":953},[939,1536,1100],{"class":957},[939,1538,1071],{"class":953},[939,1540,1105],{"class":957},[939,1542,1071],{"class":953},[939,1544,1110],{"class":957},[939,1546,1138],{"class":953},[939,1548,1549],{"class":941,"line":1264},[939,1550,1285],{"class":953},[939,1552,1553],{"class":941,"line":1282},[939,1554,1292],{"class":1291},[939,1556,1557,1559,1561,1563,1565,1567,1569,1571,1573,1575,1577,1579,1581,1583],{"class":941,"line":1288},[939,1558,1298],{"class":1181},[939,1560,1301],{"class":953},[939,1562,946],{"class":945},[939,1564,1306],{"class":949},[939,1566,1309],{"class":957},[939,1568,1312],{"class":949},[939,1570,1315],{"class":953},[939,1572,1318],{"class":949},[939,1574,1321],{"class":953},[939,1576,1079],{"class":957},[939,1578,1315],{"class":953},[939,1580,1328],{"class":949},[939,1582,1331],{"class":953},[939,1584,1221],{"class":953},[939,1586,1587,1589,1591,1593,1595,1597,1599,1601,1603,1605,1607,1609,1611,1613],{"class":941,"line":1295},[939,1588,1339],{"class":1181},[939,1590,1342],{"class":953},[939,1592,946],{"class":945},[939,1594,1348],{"class":1347},[939,1596,1309],{"class":957},[939,1598,1312],{"class":1347},[939,1600,1315],{"class":953},[939,1602,1357],{"class":1347},[939,1604,1321],{"class":953},[939,1606,1084],{"class":957},[939,1608,1315],{"class":953},[939,1610,1366],{"class":1347},[939,1612,1331],{"class":953},[939,1614,1221],{"class":953},[939,1616,1617,1619,1621,1623,1625,1627,1629,1631,1633,1635,1637,1639],{"class":941,"line":1336},[939,1618,1376],{"class":1347},[939,1620,1379],{"class":953},[939,1622,950],{"class":949},[939,1624,954],{"class":953},[939,1626,1386],{"class":1347},[939,1628,961],{"class":953},[939,1630,1391],{"class":1347},[939,1632,1394],{"class":953},[939,1634,1397],{"class":953},[939,1636,1400],{"class":953},[939,1638,1400],{"class":953},[939,1640,1207],{"class":953},[939,1642,1643],{"class":941,"line":1373},[939,1644,1410],{"class":953},[939,1646,1647,1649,1651,1653],{"class":941,"line":1407},[939,1648,1416],{"class":1347},[939,1650,1379],{"class":953},[939,1652,1421],{"class":1347},[939,1654,1207],{"class":953},[939,1656,1657],{"class":941,"line":1413},[939,1658,1429],{"class":953},[939,1660,1661],{"class":941,"line":1426},[939,1662,1138],{"class":953},[918,1664,1665,1666,1668,1669,1671,1672,1674],{},"这样当然没问题，效果就是零初始化 ",[925,1667,984],{},"，第三行 ",[925,1670,984],{}," 中的每个元素都为 ",[925,1673,1309],{},"：",[1439,1676,1677],{},[918,1678,1679],{},"1 2 3 4\n5 6 7 8\n0 0 0 0",[918,1681,1682],{},"正因如此，我们可以省略所有初始化值，写成这个样子。",[930,1684,1686],{"className":932,"code":1685,"language":934,"meta":935,"style":935},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a[3][4]{};\n    \u002F\u002F 逐个输出 a 中的元素\n    for(int i{0}; i \u003C 3; i++) {\n        for (int j{0}; j \u003C 4; j++) {\n            cout \u003C\u003C a[i][j] \u003C\u003C \" \";\n        }\n        cout \u003C\u003C endl;\n    }\n}\n",[925,1687,1688,1698,1708,1718,1734,1738,1768,1798,1824,1828,1838,1842],{"__ignoreMap":935},[939,1689,1690,1692,1694,1696],{"class":941,"line":942},[939,1691,1182],{"class":1181},[939,1693,1185],{"class":953},[939,1695,1189],{"class":1188},[939,1697,1192],{"class":953},[939,1699,1700,1702,1704,1706],{"class":941,"line":1062},[939,1701,1197],{"class":957},[939,1703,1200],{"class":945},[939,1705,1204],{"class":1203},[939,1707,1207],{"class":953},[939,1709,1710,1712,1714,1716],{"class":941,"line":1090},[939,1711,946],{"class":945},[939,1713,1215],{"class":1214},[939,1715,1218],{"class":953},[939,1717,1221],{"class":953},[939,1719,1720,1722,1724,1726,1728,1730,1732],{"class":941,"line":1115},[939,1721,1226],{"class":945},[939,1723,950],{"class":949},[939,1725,954],{"class":953},[939,1727,958],{"class":957},[939,1729,961],{"class":953},[939,1731,964],{"class":957},[939,1733,967],{"class":953},[939,1735,1736],{"class":941,"line":1141},[939,1737,1292],{"class":1291},[939,1739,1740,1742,1744,1746,1748,1750,1752,1754,1756,1758,1760,1762,1764,1766],{"class":941,"line":1250},[939,1741,1298],{"class":1181},[939,1743,1301],{"class":953},[939,1745,946],{"class":945},[939,1747,1306],{"class":949},[939,1749,1309],{"class":957},[939,1751,1312],{"class":949},[939,1753,1315],{"class":953},[939,1755,1318],{"class":949},[939,1757,1321],{"class":953},[939,1759,1079],{"class":957},[939,1761,1315],{"class":953},[939,1763,1328],{"class":949},[939,1765,1331],{"class":953},[939,1767,1221],{"class":953},[939,1769,1770,1772,1774,1776,1778,1780,1782,1784,1786,1788,1790,1792,1794,1796],{"class":941,"line":1264},[939,1771,1339],{"class":1181},[939,1773,1342],{"class":953},[939,1775,946],{"class":945},[939,1777,1348],{"class":1347},[939,1779,1309],{"class":957},[939,1781,1312],{"class":1347},[939,1783,1315],{"class":953},[939,1785,1357],{"class":1347},[939,1787,1321],{"class":953},[939,1789,1084],{"class":957},[939,1791,1315],{"class":953},[939,1793,1366],{"class":1347},[939,1795,1331],{"class":953},[939,1797,1221],{"class":953},[939,1799,1800,1802,1804,1806,1808,1810,1812,1814,1816,1818,1820,1822],{"class":941,"line":1282},[939,1801,1376],{"class":1347},[939,1803,1379],{"class":953},[939,1805,950],{"class":949},[939,1807,954],{"class":953},[939,1809,1386],{"class":1347},[939,1811,961],{"class":953},[939,1813,1391],{"class":1347},[939,1815,1394],{"class":953},[939,1817,1397],{"class":953},[939,1819,1400],{"class":953},[939,1821,1400],{"class":953},[939,1823,1207],{"class":953},[939,1825,1826],{"class":941,"line":1288},[939,1827,1410],{"class":953},[939,1829,1830,1832,1834,1836],{"class":941,"line":1295},[939,1831,1416],{"class":1347},[939,1833,1379],{"class":953},[939,1835,1421],{"class":1347},[939,1837,1207],{"class":953},[939,1839,1840],{"class":941,"line":1336},[939,1841,1429],{"class":953},[939,1843,1844],{"class":941,"line":1373},[939,1845,1138],{"class":953},[918,1847,1848,1849,1851,1852,1854,1855,1857],{},"此时，",[925,1850,973],{}," 中的 3 个 ",[925,1853,927],{}," 全部采用零初始化——也就意味着，12 个 ",[925,1856,946],{}," 的值全部初始化为 0。",[1859,1860,1861],"blockquote",{},[918,1862,1863,1864,1867,1868,1455],{},"这种逐元素初始化的方法称为聚合初始化（Aggregate initialization)。可以被聚合初始化的类型是聚合类型（Aggregate type）。所有数组类型都是聚合类型。聚合初始化时，有时可以省略内部嵌套的大括号，如 ",[925,1865,1866],{},"int a[2][2]{{1, 2}, {3, 4}};"," 可省作 ",[925,1869,1870],{},"int a[2][2]{1, 2, 3, 4};",[1032,1872,1873],{"id":1873},"三维数组及更多维",[918,1875,1876],{},"二维数组也是变量；所以如果构造一个由二维数组构成的数组，就形成了一个三维数组。比如：",[930,1878,1880],{"className":932,"code":1879,"language":934,"meta":935,"style":935},"int b[5][3][4]{};\n",[925,1881,1882],{"__ignoreMap":935},[939,1883,1884,1886,1889,1891,1893,1895,1897,1899,1901],{"class":941,"line":942},[939,1885,946],{"class":945},[939,1887,1888],{"class":949}," b",[939,1890,954],{"class":953},[939,1892,1095],{"class":957},[939,1894,961],{"class":953},[939,1896,958],{"class":957},[939,1898,961],{"class":953},[939,1900,964],{"class":957},[939,1902,967],{"class":953},[918,1904,1905,1906,1909,1910,1912,1913],{},"数组 ",[925,1907,1908],{},"b"," 是有 5 个 ",[925,1911,1015],{}," 类型的元素构成，如下所示：\n",[1006,1914],{"alt":1915,"src":1916},"3darray","https:\u002F\u002Fs1.ax1x.com\u002F2020\u002F08\u002F05\u002FasejdU.png",[918,1918,1919],{},"同样地，由三维数组构成的数组称为四维数组……你可以这样一直做下去，道理是一样的，我们便不再详细说明了。",[1921,1922,1923],"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 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