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statement","https:\u002F\u002Fs1.ax1x.com\u002F2020\u002F07\u002F08\u002FUZ7AA0.png",[941,1090,1091],{},[919,1092,1093,1094,961],{},"表达式语句中的表达式是可选的。没有表达式的表达式语句称为",[959,1095,212],{"href":213},[969,1097,1099],{"id":1098},"输入输出语句","输入输出语句……？",[919,1101,1102,1103,1106,1107,1109,1110,1106,1113,1115,1116,1118,1119,1122],{},"以 ",[986,1104,1105],{},"cin >>"," 开头的，",[986,1108,1077],{}," 结尾的一串东西可以是指定计算机从用户读取输入，这件事情我们在第一章已经接触了。同样，以 ",[986,1111,1112],{},"cout \u003C\u003C",[986,1114,1077],{}," 结尾的可以输出一些东西。这两样都是 ",[986,1117,1077],{}," 结尾，那么聪明的你一定猜到了它们也是语句的一种。没错，正是如此；我们一直用于输入输出的那种写法确实是语句，而且",[926,1120,1121],{},"是表达式语句的一种形式","。那为啥是表达式语句呢？这件事情我们会留到后面再详细讲解。",[969,1124,1125],{"id":1125},"分支语句和循环语句",[919,1127,1128,1129,1132,1133,1136],{},"第一章中的 ",[986,1130,1131],{},"if (...) {...}"," 和 ",[986,1134,1135],{},"while (...) {...}"," 也是语句，分别是分支语句和循环语句的一种。",[919,1138,1139],{},"那么这一套下来，你会发现我们从第一章到现在其实就是在搞各种语句的排列。就拿第一章最后的那个例子来看：",[979,1141,1143],{"className":981,"code":1142,"language":983,"meta":984,"style":984},"#include \u003Ciostream>\nusing namespace std;\nint main() {\n    int ans{42};                       \u002F\u002F 声明语句\n    int x{0};                          \u002F\u002F 声明语句\n    cin >> x;                          \u002F\u002F “输入语句”（实际是表达式语句）\n    while (x != ans) {                 \u002F\u002F 循环语句开始\n        if (x > ans) {                 \u002F\u002F 分支语句开始\n            cout \u003C\u003C \"bigger\" \u003C\u003C endl;  \u002F\u002F “输出语句”（实际是表达式语句）\n        }                              \u002F\u002F 分支语句结束\n        if (x \u003C ans) {                 \u002F\u002F 分支语句开始\n            cout \u003C\u003C \"smaller\" \u003C\u003C endl; \u002F\u002F “输出语句”（实际是表达式语句）\n        }                              \u002F\u002F 分支语句结束\n        cin >> x;                      \u002F\u002F “输入语句”（实际是表达式语句）\n    }                                  \u002F\u002F 循环语句结束\n    cout \u003C\u003C \"right\" \u003C\u003C endl;           \u002F\u002F “输出语句”（实际是表达式语句）\n}\n",[986,1144,1145,1161,1176,1191,1211,1229,1245,1271,1294,1323,1332,1352,1375,1382,1397,1406,1430],{"__ignoreMap":984},[989,1146,1147,1151,1154,1158],{"class":991,"line":992},[989,1148,1150],{"class":1149},"s7zQu","#include",[989,1152,1153],{"class":1003}," \u003C",[989,1155,1157],{"class":1156},"sfazB","iostream",[989,1159,1160],{"class":1003},">\n",[989,1162,1164,1167,1170,1174],{"class":991,"line":1163},2,[989,1165,1166],{"class":1007},"using",[989,1168,1169],{"class":995}," namespace",[989,1171,1173],{"class":1172},"sBMFI"," std",[989,1175,1055],{"class":1003},[989,1177,1179,1181,1185,1188],{"class":991,"line":1178},3,[989,1180,996],{"class":995},[989,1182,1184],{"class":1183},"s2Zo4"," main",[989,1186,1187],{"class":1003},"()",[989,1189,1190],{"class":1003}," {\n",[989,1192,1194,1197,1200,1202,1204,1207],{"class":991,"line":1193},4,[989,1195,1196],{"class":995},"    int",[989,1198,1199],{"class":999}," ans",[989,1201,1004],{"class":1003},[989,1203,1008],{"class":1007},[989,1205,1206],{"class":1003},"};",[989,1208,1210],{"class":1209},"sHwdD","                       \u002F\u002F 声明语句\n",[989,1212,1214,1216,1219,1221,1224,1226],{"class":991,"line":1213},5,[989,1215,1196],{"class":995},[989,1217,1218],{"class":999}," x",[989,1220,1004],{"class":1003},[989,1222,1223],{"class":1007},"0",[989,1225,1206],{"class":1003},[989,1227,1228],{"class":1209},"                          \u002F\u002F 声明语句\n",[989,1230,1232,1235,1238,1240,1242],{"class":991,"line":1231},6,[989,1233,1234],{"class":999},"    cin ",[989,1236,1237],{"class":1003},">>",[989,1239,1218],{"class":999},[989,1241,1077],{"class":1003},[989,1243,1244],{"class":1209},"                          \u002F\u002F “输入语句”（实际是表达式语句）\n",[989,1246,1248,1251,1254,1257,1260,1262,1265,1268],{"class":991,"line":1247},7,[989,1249,1250],{"class":1149},"    while",[989,1252,1253],{"class":1003}," (",[989,1255,1256],{"class":999},"x ",[989,1258,1259],{"class":1003},"!=",[989,1261,1199],{"class":999},[989,1263,1264],{"class":1003},")",[989,1266,1267],{"class":1003}," {",[989,1269,1270],{"class":1209},"                 \u002F\u002F 循环语句开始\n",[989,1272,1274,1277,1279,1282,1285,1287,1289,1291],{"class":991,"line":1273},8,[989,1275,1276],{"class":1149},"        if",[989,1278,1253],{"class":1003},[989,1280,1256],{"class":1281},"swJcz",[989,1283,1284],{"class":1003},">",[989,1286,1199],{"class":1281},[989,1288,1264],{"class":1003},[989,1290,1267],{"class":1003},[989,1292,1293],{"class":1209},"                 \u002F\u002F 分支语句开始\n",[989,1295,1297,1300,1303,1306,1309,1312,1315,1318,1320],{"class":991,"line":1296},9,[989,1298,1299],{"class":1281},"            cout ",[989,1301,1302],{"class":1003},"\u003C\u003C",[989,1304,1305],{"class":1003}," \"",[989,1307,1308],{"class":1156},"bigger",[989,1310,1311],{"class":1003},"\"",[989,1313,1314],{"class":1003}," \u003C\u003C",[989,1316,1317],{"class":1281}," endl",[989,1319,1077],{"class":1003},[989,1321,1322],{"class":1209},"  \u002F\u002F “输出语句”（实际是表达式语句）\n",[989,1324,1326,1329],{"class":991,"line":1325},10,[989,1327,1328],{"class":1003},"        }",[989,1330,1331],{"class":1209},"                              \u002F\u002F 分支语句结束\n",[989,1333,1335,1337,1339,1341,1344,1346,1348,1350],{"class":991,"line":1334},11,[989,1336,1276],{"class":1149},[989,1338,1253],{"class":1003},[989,1340,1256],{"class":1281},[989,1342,1343],{"class":1003},"\u003C",[989,1345,1199],{"class":1281},[989,1347,1264],{"class":1003},[989,1349,1267],{"class":1003},[989,1351,1293],{"class":1209},[989,1353,1355,1357,1359,1361,1364,1366,1368,1370,1372],{"class":991,"line":1354},12,[989,1356,1299],{"class":1281},[989,1358,1302],{"class":1003},[989,1360,1305],{"class":1003},[989,1362,1363],{"class":1156},"smaller",[989,1365,1311],{"class":1003},[989,1367,1314],{"class":1003},[989,1369,1317],{"class":1281},[989,1371,1077],{"class":1003},[989,1373,1374],{"class":1209}," \u002F\u002F “输出语句”（实际是表达式语句）\n",[989,1376,1378,1380],{"class":991,"line":1377},13,[989,1379,1328],{"class":1003},[989,1381,1331],{"class":1209},[989,1383,1385,1388,1390,1392,1394],{"class":991,"line":1384},14,[989,1386,1387],{"class":1281},"        cin ",[989,1389,1237],{"class":1003},[989,1391,1218],{"class":1281},[989,1393,1077],{"class":1003},[989,1395,1396],{"class":1209},"                      \u002F\u002F “输入语句”（实际是表达式语句）\n",[989,1398,1400,1403],{"class":991,"line":1399},15,[989,1401,1402],{"class":1003},"    }",[989,1404,1405],{"class":1209},"                                  \u002F\u002F 循环语句结束\n",[989,1407,1409,1412,1414,1416,1419,1421,1423,1425,1427],{"class":991,"line":1408},16,[989,1410,1411],{"class":999},"    cout ",[989,1413,1302],{"class":1003},[989,1415,1305],{"class":1003},[989,1417,1418],{"class":1156},"right",[989,1420,1311],{"class":1003},[989,1422,1314],{"class":1003},[989,1424,1317],{"class":999},[989,1426,1077],{"class":1003},[989,1428,1429],{"class":1209},"           \u002F\u002F “输出语句”（实际是表达式语句）\n",[989,1431,1433],{"class":991,"line":1432},17,[989,1434,1435],{"class":1003},"}\n",[919,1437,1438],{},"所以说语句是 C++ 控制成分的核心，也是它非常关键的原因所在。",[1440,1441,1442],"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}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":984,"searchDepth":992,"depth":1163,"links":1444},[1445],{"id":952,"depth":1163,"text":952,"children":1446},[1447,1448,1449,1450],{"id":119,"depth":1178,"text":119},{"id":1025,"depth":1178,"text":1025},{"id":1098,"depth":1178,"text":1099},{"id":1125,"depth":1178,"text":1125},"控制成分","md",null,{},{"icon":190},{"title":189,"description":1451},"j3jSel9fwPgiI-9px68AIyqojsKEku4zVW3177ITGfQ",[1459,1460],{"title":185,"path":186,"stem":187,"description":185,"icon":151,"children":-1},{"title":196,"path":197,"stem":198,"description":1461,"icon":190,"children":-1},"运用复合语句（Compound statement），可以将多条语句变为一条语句。",1784618114067]