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",[998,999,1000],"code",{},"true"," 将转换为 ",[998,1003,1004],{},"1"," ， ",[998,1007,1008],{},"false",[998,1010,1011],{},"0"," 。\n其它算术类型转向布尔类型时，非零值将转换为 ",[998,1014,1000],{}," ，零值将转换为 ",[998,1017,1008],{}," 。",[948,1020,1021],{"id":1021},"例子",[1023,1024,1026],"h3",{"id":1025},"例11","例1.1",[1028,1029,1034],"pre",{"className":1030,"code":1031,"language":1032,"meta":1033,"style":1033},"language-cpp shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","#include \u003Ciostream>\nusing namespace std;\nint main() {\n    short s1{-123}, s2{42};\n    int i1{0}, i2{0};\n    i1 = s1;\n    i2 = s2;\n    cout \u003C\u003C i1 \u003C\u003C \" \" \u003C\u003C i2 \u003C\u003C endl;\n}\n","cpp","",[998,1035,1036,1056,1074,1090,1121,1145,1158,1170,1202],{"__ignoreMap":1033},[1037,1038,1041,1045,1049,1053],"span",{"class":1039,"line":1040},"line",1,[1037,1042,1044],{"class":1043},"s7zQu","#include",[1037,1046,1048],{"class":1047},"sMK4o"," 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s2",[1037,1113,1114],{"class":1047},"{",[1037,1116,1117],{"class":1061},"42",[1037,1119,1120],{"class":1047},"};\n",[1037,1122,1124,1127,1130,1132,1134,1136,1139,1141,1143],{"class":1039,"line":1123},5,[1037,1125,1126],{"class":1065},"    int",[1037,1128,1129],{"class":1098}," i1",[1037,1131,1114],{"class":1047},[1037,1133,1011],{"class":1061},[1037,1135,1108],{"class":1047},[1037,1137,1138],{"class":1098}," i2",[1037,1140,1114],{"class":1047},[1037,1142,1011],{"class":1061},[1037,1144,1120],{"class":1047},[1037,1146,1148,1151,1154,1156],{"class":1039,"line":1147},6,[1037,1149,1150],{"class":1098},"    i1 ",[1037,1152,1153],{"class":1047},"=",[1037,1155,1099],{"class":1098},[1037,1157,1073],{"class":1047},[1037,1159,1161,1164,1166,1168],{"class":1039,"line":1160},7,[1037,1162,1163],{"class":1098},"    i2 ",[1037,1165,1153],{"class":1047},[1037,1167,1111],{"class":1098},[1037,1169,1073],{"class":1047},[1037,1171,1173,1176,1179,1182,1184,1187,1189,1192,1195,1197,1200],{"class":1039,"line":1172},8,[1037,1174,1175],{"class":1098},"    cout ",[1037,1177,1178],{"class":1047},"\u003C\u003C",[1037,1180,1181],{"class":1098}," i1 ",[1037,1183,1178],{"class":1047},[1037,1185,1186],{"class":1047}," \"",[1037,1188,1186],{"class":1047},[1037,1190,1191],{"class":1047}," \u003C\u003C",[1037,1193,1194],{"class":1098}," i2 ",[1037,1196,1178],{"class":1047},[1037,1198,1199],{"class":1098}," endl",[1037,1201,1073],{"class":1047},[1037,1203,1205],{"class":1039,"line":1204},9,[1037,1206,1207],{"class":1047},"}\n",[918,1209,1210],{},"结果保持源值：",[1212,1213,1214],"io-block",{},[918,1215,1216],{},"-123 42",[1023,1218,1220],{"id":1219},"例12","例1.2",[1028,1222,1224],{"className":1030,"code":1223,"language":1032,"meta":1033,"style":1033},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    signed int si{42};\n    unsigned int ui{0};\n    ui = si;\n    cout \u003C\u003C ui \u003C\u003C endl;\n}\n",[998,1225,1226,1236,1246,1256,1273,1289,1300,1315],{"__ignoreMap":1033},[1037,1227,1228,1230,1232,1234],{"class":1039,"line":1040},[1037,1229,1044],{"class":1043},[1037,1231,1048],{"class":1047},[1037,1233,1052],{"class":1051},[1037,1235,1055],{"class":1047},[1037,1237,1238,1240,1242,1244],{"class":1039,"line":1058},[1037,1239,1062],{"class":1061},[1037,1241,1066],{"class":1065},[1037,1243,1070],{"class":1069},[1037,1245,1073],{"class":1047},[1037,1247,1248,1250,1252,1254],{"class":1039,"line":1076},[1037,1249,1079],{"class":1065},[1037,1251,1083],{"class":1082},[1037,1253,1086],{"class":1047},[1037,1255,1089],{"class":1047},[1037,1257,1258,1261,1264,1267,1269,1271],{"class":1039,"line":1092},[1037,1259,1260],{"class":1065},"    signed",[1037,1262,1263],{"class":1065}," int",[1037,1265,1266],{"class":1098}," si",[1037,1268,1114],{"class":1047},[1037,1270,1117],{"class":1061},[1037,1272,1120],{"class":1047},[1037,1274,1275,1278,1280,1283,1285,1287],{"class":1039,"line":1123},[1037,1276,1277],{"class":1065},"    unsigned",[1037,1279,1263],{"class":1065},[1037,1281,1282],{"class":1098}," ui",[1037,1284,1114],{"class":1047},[1037,1286,1011],{"class":1061},[1037,1288,1120],{"class":1047},[1037,1290,1291,1294,1296,1298],{"class":1039,"line":1147},[1037,1292,1293],{"class":1098},"    ui ",[1037,1295,1153],{"class":1047},[1037,1297,1266],{"class":1098},[1037,1299,1073],{"class":1047},[1037,1301,1302,1304,1306,1309,1311,1313],{"class":1039,"line":1160},[1037,1303,1175],{"class":1098},[1037,1305,1178],{"class":1047},[1037,1307,1308],{"class":1098}," ui ",[1037,1310,1178],{"class":1047},[1037,1312,1199],{"class":1098},[1037,1314,1073],{"class":1047},[1037,1316,1317],{"class":1039,"line":1172},[1037,1318,1207],{"class":1047},[918,1320,1210],{},[1212,1322,1323],{},[918,1324,1117],{},[1023,1326,1327],{"id":1327},"例2",[1028,1329,1331],{"className":1030,"code":1330,"language":1032,"meta":1033,"style":1033},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    unsigned int ui{0x0042abcd};\n    short s{0};\n    s = ui;\n    cout \u003C\u003C hex; \u002F\u002F 这一行用于调整输出为十六进制格式，不是输出语句\n    cout \u003C\u003C s \u003C\u003C endl;\n}\n",[998,1332,1333,1343,1353,1363,1378,1391,1402,1418,1433],{"__ignoreMap":1033},[1037,1334,1335,1337,1339,1341],{"class":1039,"line":1040},[1037,1336,1044],{"class":1043},[1037,1338,1048],{"class":1047},[1037,1340,1052],{"class":1051},[1037,1342,1055],{"class":1047},[1037,1344,1345,1347,1349,1351],{"class":1039,"line":1058},[1037,1346,1062],{"class":1061},[1037,1348,1066],{"class":1065},[1037,1350,1070],{"class":1069},[1037,1352,1073],{"class":1047},[1037,1354,1355,1357,1359,1361],{"class":1039,"line":1076},[1037,1356,1079],{"class":1065},[1037,1358,1083],{"class":1082},[1037,1360,1086],{"class":1047},[1037,1362,1089],{"class":1047},[1037,1364,1365,1367,1369,1371,1373,1376],{"class":1039,"line":1092},[1037,1366,1277],{"class":1065},[1037,1368,1263],{"class":1065},[1037,1370,1282],{"class":1098},[1037,1372,1114],{"class":1047},[1037,1374,1375],{"class":1061},"0x0042abcd",[1037,1377,1120],{"class":1047},[1037,1379,1380,1382,1385,1387,1389],{"class":1039,"line":1123},[1037,1381,1095],{"class":1065},[1037,1383,1384],{"class":1098}," s",[1037,1386,1114],{"class":1047},[1037,1388,1011],{"class":1061},[1037,1390,1120],{"class":1047},[1037,1392,1393,1396,1398,1400],{"class":1039,"line":1147},[1037,1394,1395],{"class":1098},"    s ",[1037,1397,1153],{"class":1047},[1037,1399,1282],{"class":1098},[1037,1401,1073],{"class":1047},[1037,1403,1404,1406,1408,1411,1414],{"class":1039,"line":1160},[1037,1405,1175],{"class":1098},[1037,1407,1178],{"class":1047},[1037,1409,1410],{"class":1098}," hex",[1037,1412,1413],{"class":1047},";",[1037,1415,1417],{"class":1416},"sHwdD"," \u002F\u002F 这一行用于调整输出为十六进制格式，不是输出语句\n",[1037,1419,1420,1422,1424,1427,1429,1431],{"class":1039,"line":1172},[1037,1421,1175],{"class":1098},[1037,1423,1178],{"class":1047},[1037,1425,1426],{"class":1098}," s ",[1037,1428,1178],{"class":1047},[1037,1430,1199],{"class":1098},[1037,1432,1073],{"class":1047},[1037,1434,1435],{"class":1039,"line":1204},[1037,1436,1207],{"class":1047},[918,1438,1439],{},"结果保留低 16 位：",[1212,1441,1442],{},[918,1443,1444],{},"abcd",[1023,1446,1447],{"id":1447},"例3",[1028,1449,1451],{"className":1030,"code":1450,"language":1032,"meta":1033,"style":1033},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    signed int si{-1};  \u002F\u002F 0xffffffff\n    unsigned int ui{0};\n    ui = si;\n    cout \u003C\u003C ui \u003C\u003C endl;\n    cout \u003C\u003C hex;        \u002F\u002F 调整为以十六进制格式输出\n    cout \u003C\u003C ui \u003C\u003C endl;\n}\n",[998,1452,1453,1463,1473,1483,1501,1515,1525,1539,1552,1566],{"__ignoreMap":1033},[1037,1454,1455,1457,1459,1461],{"class":1039,"line":1040},[1037,1456,1044],{"class":1043},[1037,1458,1048],{"class":1047},[1037,1460,1052],{"class":1051},[1037,1462,1055],{"class":1047},[1037,1464,1465,1467,1469,1471],{"class":1039,"line":1058},[1037,1466,1062],{"class":1061},[1037,1468,1066],{"class":1065},[1037,1470,1070],{"class":1069},[1037,1472,1073],{"class":1047},[1037,1474,1475,1477,1479,1481],{"class":1039,"line":1076},[1037,1476,1079],{"class":1065},[1037,1478,1083],{"class":1082},[1037,1480,1086],{"class":1047},[1037,1482,1089],{"class":1047},[1037,1484,1485,1487,1489,1491,1493,1495,1498],{"class":1039,"line":1092},[1037,1486,1260],{"class":1065},[1037,1488,1263],{"class":1065},[1037,1490,1266],{"class":1098},[1037,1492,1102],{"class":1047},[1037,1494,1004],{"class":1061},[1037,1496,1497],{"class":1047},"};",[1037,1499,1500],{"class":1416},"  \u002F\u002F 0xffffffff\n",[1037,1502,1503,1505,1507,1509,1511,1513],{"class":1039,"line":1123},[1037,1504,1277],{"class":1065},[1037,1506,1263],{"class":1065},[1037,1508,1282],{"class":1098},[1037,1510,1114],{"class":1047},[1037,1512,1011],{"class":1061},[1037,1514,1120],{"class":1047},[1037,1516,1517,1519,1521,1523],{"class":1039,"line":1147},[1037,1518,1293],{"class":1098},[1037,1520,1153],{"class":1047},[1037,1522,1266],{"class":1098},[1037,1524,1073],{"class":1047},[1037,1526,1527,1529,1531,1533,1535,1537],{"class":1039,"line":1160},[1037,1528,1175],{"class":1098},[1037,1530,1178],{"class":1047},[1037,1532,1308],{"class":1098},[1037,1534,1178],{"class":1047},[1037,1536,1199],{"class":1098},[1037,1538,1073],{"class":1047},[1037,1540,1541,1543,1545,1547,1549],{"class":1039,"line":1172},[1037,1542,1175],{"class":1098},[1037,1544,1178],{"class":1047},[1037,1546,1410],{"class":1098},[1037,1548,1413],{"class":1047},[1037,1550,1551],{"class":1416},"        \u002F\u002F 调整为以十六进制格式输出\n",[1037,1553,1554,1556,1558,1560,1562,1564],{"class":1039,"line":1204},[1037,1555,1175],{"class":1098},[1037,1557,1178],{"class":1047},[1037,1559,1308],{"class":1098},[1037,1561,1178],{"class":1047},[1037,1563,1199],{"class":1098},[1037,1565,1073],{"class":1047},[1037,1567,1569],{"class":1039,"line":1568},10,[1037,1570,1207],{"class":1047},[918,1572,1573],{},"不管是否有符号，保持内存存储不变：",[1212,1575,1576],{},[918,1577,1578],{},"4294967295\nffffffff",[948,1580,1581],{"id":1581},"注意事项",[918,1583,1584,1585,1588,1589,1592],{},"目前我们只知道在赋值和 ",[998,1586,1587],{},"if"," 、 ",[998,1590,1591],{},"while"," 的条件中会发生隐式转换。实际上，还有一种常见的场景会发生隐式转换——初始化。",[918,1594,1595],{},"在使用初始化器进行初始化的过程中，若初始化器中的初始化值类型和目标类型不吻合，会进行如上文所述的隐式转换规则：",[1028,1597,1599],{"className":1030,"code":1598,"language":1032,"meta":1033,"style":1033},"int a{42LL};  \u002F\u002F 从 long long 类型转换为 int\ndouble b{42}; \u002F\u002F 从 int 类型转换为 double\n",[998,1600,1601,1618],{"__ignoreMap":1033},[1037,1602,1603,1605,1608,1610,1613,1615],{"class":1039,"line":1040},[1037,1604,1079],{"class":1065},[1037,1606,1607],{"class":1098}," a",[1037,1609,1114],{"class":1047},[1037,1611,1612],{"class":1061},"42LL",[1037,1614,1497],{"class":1047},[1037,1616,1617],{"class":1416},"  \u002F\u002F 从 long long 类型转换为 int\n",[1037,1619,1620,1623,1626,1628,1630,1632],{"class":1039,"line":1058},[1037,1621,1622],{"class":1065},"double",[1037,1624,1625],{"class":1098}," b",[1037,1627,1114],{"class":1047},[1037,1629,1117],{"class":1061},[1037,1631,1497],{"class":1047},[1037,1633,1634],{"class":1416}," \u002F\u002F 从 int 类型转换为 double\n",[918,1636,1637],{},"这个过程和赋值类似。但是有一些转换是被禁止的：",[958,1639,1640,1643,1646],{},[961,1641,1642],{},"任何从浮点类型到整数类型的转换被禁止；",[961,1644,1645],{},"从整数类型到浮点类型的转换被禁止，常量初始化除外；",[961,1647,1648,1649,1651],{},"从“高层级”类型到“低层级”类型（见",[922,1650,157],{"href":158},"章节）的转换被禁止，常量初始化除外；",[918,1653,1654],{},"其中常量初始化（Constant initialization）是指初始化值为常量的初始化器。故下列初始化都是不可行的：",[1028,1656,1658],{"className":1030,"code":1657,"language":1032,"meta":1033,"style":1033},"int a{3.14}; \u002F\u002F 任何情形不允许从浮点类型转为整数类型\ndouble b{a}; \u002F\u002F 不允许从整数类型转为浮点类型，因为这不是常量初始化\nfloat c{b};  \u002F\u002F 不允许从“高层级”的浮点类型 double 转换到“低层级”的浮点类型 float\nshort d{a};  \u002F\u002F 不允许从“高层级”的整数类型 int 转换到“低层级”的整数类型 short\n",[998,1659,1660,1676,1692,1710],{"__ignoreMap":1033},[1037,1661,1662,1664,1666,1668,1671,1673],{"class":1039,"line":1040},[1037,1663,1079],{"class":1065},[1037,1665,1607],{"class":1098},[1037,1667,1114],{"class":1047},[1037,1669,1670],{"class":1061},"3.14",[1037,1672,1497],{"class":1047},[1037,1674,1675],{"class":1416}," \u002F\u002F 任何情形不允许从浮点类型转为整数类型\n",[1037,1677,1678,1680,1682,1684,1687,1689],{"class":1039,"line":1058},[1037,1679,1622],{"class":1065},[1037,1681,1625],{"class":1098},[1037,1683,1114],{"class":1047},[1037,1685,922],{"class":1686},"swJcz",[1037,1688,1497],{"class":1047},[1037,1690,1691],{"class":1416}," \u002F\u002F 不允许从整数类型转为浮点类型，因为这不是常量初始化\n",[1037,1693,1694,1697,1700,1702,1705,1707],{"class":1039,"line":1076},[1037,1695,1696],{"class":1065},"float",[1037,1698,1699],{"class":1098}," c",[1037,1701,1114],{"class":1047},[1037,1703,1704],{"class":1686},"b",[1037,1706,1497],{"class":1047},[1037,1708,1709],{"class":1416},"  \u002F\u002F 不允许从“高层级”的浮点类型 double 转换到“低层级”的浮点类型 float\n",[1037,1711,1712,1715,1718,1720,1722,1724],{"class":1039,"line":1092},[1037,1713,1714],{"class":1065},"short",[1037,1716,1717],{"class":1098}," d",[1037,1719,1114],{"class":1047},[1037,1721,922],{"class":1686},[1037,1723,1497],{"class":1047},[1037,1725,1726],{"class":1416},"  \u002F\u002F 不允许从“高层级”的整数类型 int 转换到“低层级”的整数类型 short\n",[918,1728,1729],{},"这三种被禁止的转换称为窄化转换（Narrowing conversion）。窄化转换有潜在的丢失数据的危险，因此它们在关键的初始化步骤被禁止。如果你确实有这样的需求，可以：",[918,1731,1732],{},"使用赋值：",[1028,1734,1736],{"className":1030,"code":1735,"language":1032,"meta":1033,"style":1033},"int a{42};\n\u002F\u002F double b{a}; 禁止窄化转换\ndouble b;\nb = a;\n",[998,1737,1738,1750,1755,1763],{"__ignoreMap":1033},[1037,1739,1740,1742,1744,1746,1748],{"class":1039,"line":1040},[1037,1741,1079],{"class":1065},[1037,1743,1607],{"class":1098},[1037,1745,1114],{"class":1047},[1037,1747,1117],{"class":1061},[1037,1749,1120],{"class":1047},[1037,1751,1752],{"class":1039,"line":1058},[1037,1753,1754],{"class":1416},"\u002F\u002F double b{a}; 禁止窄化转换\n",[1037,1756,1757,1759,1761],{"class":1039,"line":1076},[1037,1758,1622],{"class":1065},[1037,1760,1625],{"class":1098},[1037,1762,1073],{"class":1047},[1037,1764,1765,1768,1770,1772],{"class":1039,"line":1092},[1037,1766,1767],{"class":1098},"b ",[1037,1769,1153],{"class":1047},[1037,1771,1607],{"class":1098},[1037,1773,1073],{"class":1047},[918,1775,1776],{},"或者使用显式类型转换：",[1028,1778,1780],{"className":1030,"code":1779,"language":1032,"meta":1033,"style":1033},"int a{42};\n\u002F\u002F double b{a}; 禁止窄化转换\ndouble b{double(a)};\n",[998,1781,1782,1794,1798],{"__ignoreMap":1033},[1037,1783,1784,1786,1788,1790,1792],{"class":1039,"line":1040},[1037,1785,1079],{"class":1065},[1037,1787,1607],{"class":1098},[1037,1789,1114],{"class":1047},[1037,1791,1117],{"class":1061},[1037,1793,1120],{"class":1047},[1037,1795,1796],{"class":1039,"line":1058},[1037,1797,1754],{"class":1416},[1037,1799,1800,1802,1804,1806,1808,1811,1813],{"class":1039,"line":1076},[1037,1801,1622],{"class":1065},[1037,1803,1625],{"class":1098},[1037,1805,1114],{"class":1047},[1037,1807,1622],{"class":1065},[1037,1809,1810],{"class":1047},"(",[1037,1812,922],{"class":1686},[1037,1814,1815],{"class":1047},")};\n",[932,1817,1818],{},[918,1819,1820,1821,1824],{},"实际上这个转换的限制只作用于列表初始化；对于复制初始化无此限制。所以你完全可以使用 ",[998,1822,1823],{},"int a = 3.14"," 这一写法来防止错误。但是请注意，在初始化中进行窄化转换是不好的编程习惯（Code smell），本书也不推荐通过复制初始化来绕开此限制。",[932,1826,1827],{},[918,1828,1829,1830,1835],{},"对于部分编译器（如 ",[922,1831,1834],{"href":1832,"rel":1833},"https:\u002F\u002Fgcc.gnu.org\u002Fwiki\u002FFAQ#Wnarrowing",[941],"GCC","）来说，某些窄化转换可能只报编译警告（Warning）而非编译错误（Error）。",[1837,1838,1839],"style",{},"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 .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 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