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",[946,1033,1035],{"colSpan":1034,"rowSpan":1034},2,[949,1036,951],{},[946,1038,1039],{"colSpan":1034},[949,1040,1041],{},"a",[928,1043,1031,1044,1031,1048,1026],{},[946,1045,1046],{},[949,1047,965],{},[946,1049,1050],{},[949,1051,1013],{},[928,1053,1031,1054,1031,1059,1031,1063,1031,1067,1026],{},[946,1055,1056],{"rowSpan":1034},[949,1057,1058],{},"b",[946,1060,1061],{},[949,1062,965],{},[946,1064,1065],{},[949,1066,965],{},[946,1068,1069],{},[949,1070,1013],{},[928,1072,1031,1073,1031,1077,1031,1081,1026],{},[946,1074,1075],{},[949,1076,1013],{},[946,1078,1079],{},[949,1080,1013],{},[946,1082,1083],{},[949,1084,1013],{},[922,1086,1026,1087],{"style":1025},[941,1088,1089,1026,1099,1026,1109,1026,1127],{},[928,1090,1031,1091,1031,1095,1026],{},[946,1092,1093],{"colSpan":1034,"rowSpan":1034},[949,1094,972],{},[946,1096,1097],{"colSpan":1034},[949,1098,1041],{},[928,1100,1031,1101,1031,1105,1026],{},[946,1102,1103],{},[949,1104,965],{},[946,1106,1107],{},[949,1108,1013],{},[928,1110,1031,1111,1031,1115,1031,1119,1031,1123,1026],{},[946,1112,1113],{"rowSpan":1034},[949,1114,1058],{},[946,1116,1117],{},[949,1118,965],{},[946,1120,1121],{},[949,1122,965],{},[946,1124,1125],{},[949,1126,965],{},[928,1128,1031,1129,1031,1133,1031,1137,1026],{},[946,1130,1131],{},[949,1132,1013],{},[946,1134,1135],{},[949,1136,965],{},[946,1138,1139],{},[949,1140,1013],{},[922,1142,1026,1143],{"style":1025},[941,1144,1145,1026,1153,1026,1163],{},[928,1146,1031,1147,1031,1149,1026],{},[946,1148],{"rowSpan":1034},[946,1150,1151],{"colSpan":1034},[949,1152,1041],{},[928,1154,1031,1155,1031,1159,1026],{},[946,1156,1157],{},[949,1158,965],{},[946,1160,1161],{},[949,1162,1013],{},[928,1164,1031,1165,1031,1169,1031,1173,1026],{},[946,1166,1167],{},[949,1168,989],{},[946,1170,1171],{},[949,1172,1013],{},[946,1174,1175],{},[949,1176,965],{},[1178,1179,1180],"h2",{"id":1180},"优先级和结合方向",[918,1182,1183],{},"三种逻辑运算符的优先级都不同：非运算符的优先级最高，与前缀自增\u002F减运算符同级。逻辑与运算符其次，次于等于\u002F不等于运算符。逻辑或运算符优先级相对最低。",[918,1185,1186],{},"它们的结合方向是：",[1188,1189,1190,1201],"ul",{},[1191,1192,1193,1194,1197,1198,1014],"li",{},"非运算符的结合方向为从右向左，即 ",[949,1195,1196],{},"!!!a"," 等价于 ",[949,1199,1200],{},"!(!(!a))",[1191,1202,1203,1204,1197,1207,1014],{},"逻辑与和逻辑或运算符的结合方向为从左向右，即 ",[949,1205,1206],{},"a || b || c",[949,1208,1209],{},"(a || b) || c",[918,1211,1212],{},"因此对于下面这个复杂的表达式",[1214,1215,1220],"pre",{"className":1216,"code":1217,"language":1218,"meta":1219,"style":1219},"language-cpp shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","a && !b || c && d && e\n","cpp","",[949,1221,1222],{"__ignoreMap":1219},[1223,1224,1227,1231,1235,1238,1241,1244,1247,1249,1252,1254],"span",{"class":1225,"line":1226},"line",1,[1223,1228,1230],{"class":1229},"sTEyZ","a ",[1223,1232,1234],{"class":1233},"sMK4o","&&",[1223,1236,1237],{"class":1233}," !",[1223,1239,1240],{"class":1229},"b ",[1223,1242,1243],{"class":1233},"||",[1223,1245,1246],{"class":1229}," c ",[1223,1248,1234],{"class":1233},[1223,1250,1251],{"class":1229}," d ",[1223,1253,1234],{"class":1233},[1223,1255,1256],{"class":1229}," e\n",[918,1258,1259,1260,1014],{},"它等价于 ",[949,1261,1262],{},"(a && (!b)) || ((c && d) && e)",[1178,1264,1265],{"id":1265},"注意事项",[918,1267,1268],{},"当计算机求值逻辑表达式时，并不总是执行全部的运算。举例来说：对于逻辑表达式：",[1214,1270,1272],{"className":1216,"code":1271,"language":1218,"meta":1219,"style":1219},"a && (b = 0)\n",[949,1273,1274],{"__ignoreMap":1219},[1223,1275,1276,1278,1280,1283,1285,1288,1292],{"class":1225,"line":1226},[1223,1277,1230],{"class":1229},[1223,1279,1234],{"class":1233},[1223,1281,1282],{"class":1233}," (",[1223,1284,1240],{"class":1229},[1223,1286,1287],{"class":1233},"=",[1223,1289,1291],{"class":1290},"sbssI"," 0",[1223,1293,1294],{"class":1233},")\n",[918,1296,1297,1298,1300,1301,1303,1304,1306,1307,962,1310,1313,1314,1316,1317,962,1319,1322],{},"若 ",[949,1299,1041],{}," 求值结果为 ",[949,1302,1013],{}," ，则显然整个表达式的值必然为 ",[949,1305,1013],{}," ，故计算机",[959,1308,1309],{},"不计算",[949,1311,1312],{},"b = 0"," 表达式的值。所以 ",[949,1315,1312],{}," 赋值表达式不会被执行， ",[949,1318,1058],{},[959,1320,1321],{},"未被赋值","。",[918,1324,1325,1326,1328,1329,1331,1332,1335],{},"即对于逻辑与运算符来说，若左侧操作数求值结果为 ",[949,1327,1013],{}," ，则不求值右侧操作数。同理，对于逻辑或运算符来说，若左侧操作数求值结果为 ",[949,1330,965],{}," ，则不求值右侧操作数。此特性被称作逻辑运算符的",[959,1333,1334],{},"短路求值","（Short-circuiting）特性。",[918,1337,1338],{},"例如：",[1214,1340,1342],{"className":1216,"code":1341,"language":1218,"meta":1219,"style":1219},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int a{42}, b{42}, c{42};\n    bool result;\n    result = ++a || ++b || ++c;\n    cout \u003C\u003C boolalpha;\n    cout \u003C\u003C result \u003C\u003C endl;\n    cout \u003C\u003C a \u003C\u003C \" \" \u003C\u003C b \u003C\u003C \" \" \u003C\u003C c \u003C\u003C endl;\n}\n",[949,1343,1344,1360,1376,1392,1429,1440,1468,1482,1499,1538],{"__ignoreMap":1219},[1223,1345,1346,1350,1353,1357],{"class":1225,"line":1226},[1223,1347,1349],{"class":1348},"s7zQu","#include",[1223,1351,1352],{"class":1233}," \u003C",[1223,1354,1356],{"class":1355},"sfazB","iostream",[1223,1358,1359],{"class":1233},">\n",[1223,1361,1362,1365,1369,1373],{"class":1225,"line":1034},[1223,1363,1364],{"class":1290},"using",[1223,1366,1368],{"class":1367},"spNyl"," namespace",[1223,1370,1372],{"class":1371},"sBMFI"," std",[1223,1374,1375],{"class":1233},";\n",[1223,1377,1379,1382,1386,1389],{"class":1225,"line":1378},3,[1223,1380,1381],{"class":1367},"int",[1223,1383,1385],{"class":1384},"s2Zo4"," main",[1223,1387,1388],{"class":1233},"()",[1223,1390,1391],{"class":1233}," {\n",[1223,1393,1395,1398,1401,1404,1407,1410,1413,1415,1417,1419,1422,1424,1426],{"class":1225,"line":1394},4,[1223,1396,1397],{"class":1367},"    int",[1223,1399,1400],{"class":1229}," a",[1223,1402,1403],{"class":1233},"{",[1223,1405,1406],{"class":1290},"42",[1223,1408,1409],{"class":1233},"},",[1223,1411,1412],{"class":1229}," b",[1223,1414,1403],{"class":1233},[1223,1416,1406],{"class":1290},[1223,1418,1409],{"class":1233},[1223,1420,1421],{"class":1229}," c",[1223,1423,1403],{"class":1233},[1223,1425,1406],{"class":1290},[1223,1427,1428],{"class":1233},"};\n",[1223,1430,1432,1435,1438],{"class":1225,"line":1431},5,[1223,1433,1434],{"class":1367},"    bool",[1223,1436,1437],{"class":1229}," result",[1223,1439,1375],{"class":1233},[1223,1441,1443,1446,1448,1451,1453,1455,1457,1459,1461,1463,1466],{"class":1225,"line":1442},6,[1223,1444,1445],{"class":1229},"    result ",[1223,1447,1287],{"class":1233},[1223,1449,1450],{"class":1233}," ++",[1223,1452,1230],{"class":1229},[1223,1454,1243],{"class":1233},[1223,1456,1450],{"class":1233},[1223,1458,1240],{"class":1229},[1223,1460,1243],{"class":1233},[1223,1462,1450],{"class":1233},[1223,1464,1465],{"class":1229},"c",[1223,1467,1375],{"class":1233},[1223,1469,1471,1474,1477,1480],{"class":1225,"line":1470},7,[1223,1472,1473],{"class":1229},"    cout ",[1223,1475,1476],{"class":1233},"\u003C\u003C",[1223,1478,1479],{"class":1229}," boolalpha",[1223,1481,1375],{"class":1233},[1223,1483,1485,1487,1489,1492,1494,1497],{"class":1225,"line":1484},8,[1223,1486,1473],{"class":1229},[1223,1488,1476],{"class":1233},[1223,1490,1491],{"class":1229}," result ",[1223,1493,1476],{"class":1233},[1223,1495,1496],{"class":1229}," endl",[1223,1498,1375],{"class":1233},[1223,1500,1502,1504,1506,1509,1511,1514,1516,1519,1522,1524,1526,1528,1530,1532,1534,1536],{"class":1225,"line":1501},9,[1223,1503,1473],{"class":1229},[1223,1505,1476],{"class":1233},[1223,1507,1508],{"class":1229}," a ",[1223,1510,1476],{"class":1233},[1223,1512,1513],{"class":1233}," \"",[1223,1515,1513],{"class":1233},[1223,1517,1518],{"class":1233}," \u003C\u003C",[1223,1520,1521],{"class":1229}," b ",[1223,1523,1476],{"class":1233},[1223,1525,1513],{"class":1233},[1223,1527,1513],{"class":1233},[1223,1529,1518],{"class":1233},[1223,1531,1246],{"class":1229},[1223,1533,1476],{"class":1233},[1223,1535,1496],{"class":1229},[1223,1537,1375],{"class":1233},[1223,1539,1541],{"class":1225,"line":1540},10,[1223,1542,1543],{"class":1233},"}\n",[918,1545,1546],{},"这段程序编译运行的结果为：",[1548,1549,1550],"io-block",{},[918,1551,1552],{},"true\n43 42 42",[918,1554,1555,1556,1559,1560,1563,1564,1567,1568,1570,1571,1574,1575,1577,1578,1581,1582,1584,1585,1588,1589,1591,1592,1594,1595,1597,1598,1600,1601,1603],{},"下面来解释以下。当执行 ",[949,1557,1558],{},"result"," 的赋值表达式时，先计算 ",[949,1561,1562],{},"(++a || ++b)"," 的值。由于 ",[949,1565,1566],{},"++a"," 将 ",[949,1569,1041],{}," 自增后返回 ",[949,1572,1573],{},"43"," ，这个非布尔类型遇到逻辑或运算符将隐式转换为 ",[949,1576,965],{}," ，故触发逻辑或运算符的短路特性，不求值 ",[949,1579,1580],{},"++b"," 。同理，整个表达式的值为 ",[949,1583,965],{}," 时，触发第二个逻辑或运算符的短路特性，不求值 ",[949,1586,1587],{},"++c"," 。因此只有 ",[949,1590,1041],{}," 的值被更改为 ",[949,1593,1573],{}," ，而 ",[949,1596,1058],{}," 和 ",[949,1599,1465],{}," 保持 ",[949,1602,1406],{}," 不变。",[1178,1605,1606],{"id":1606},"练习",[1608,1609,1610],"ol",{},[1191,1611,1612,1613,1616,1617],{},"使用表达式判别某一年 ",[949,1614,1615],{},"year"," 是否为闰年。闰年的条件是符合下面二者之一：\n",[1188,1618,1619,1622],{},[1191,1620,1621],{},"能被4整除，但不能被100整除。",[1191,1623,1624],{},"能被100整除，又能被400整除。",[1178,1626,1627],{"id":1627},"练习参考答案",[1188,1629,1630,1636],{},[1191,1631,1632,1633],{},"法1： ",[949,1634,1635],{},"(year % 4 == 0 && year % 100 != 0) || year % 400 == 0",[1191,1637,1638,1639],{},"法2： ",[949,1640,1641],{},"!((year % 4 != 0) || (year % 100 == 0 && year % 400 != 0))",[1643,1644,1645],"style",{},"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 .light .shiki span {color: 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