一個 switch 語句允許測試一個變量等于多個值時(shí)的情況。每個值稱為一個 case，且被測試的變量會對每個 switch case 進(jìn)行檢查。

流程圖

//下面的語句是由用戶輸入的char變量值來控制 #include <stdio.h> int main(void) {char answer = 0;printf("Enter Y or N:");scanf(" %c",&answer);switch(answer){ //可以把多個case值與一組語句聯(lián)系起來case 'Y':case 'y':printf("You responded in the affirmative.\n");break;case 'N':case 'n':printf("You responded in the negative.\n");break;default:printf("You did not respond correctly...\n");break;}return 0; }

?/*
?* switch語句中的case順序是可任意的，default不一定是最后一個case
?* */

//輸入1-10內(nèi)的任意數(shù)字；各別數(shù)字對應(yīng)對應(yīng)不同的提示信息，有些數(shù)字沒有。 #include <stdio.h> int main() {int choice = 0;printf("Pick a number between 1 and 10 and you may win a prize:");scanf("%d",&choice);if((choice > 10) || (choice < 1))choice = 11;switch(choice){case 7:printf("You win the collected works of Amos of Amos Gruntfuttock.\n");break;case 2:printf("You win the folding thermomenter-pen-watch-unbrella.\n");break;case 8:printf("You win the lifetime supply of aspirin tablets.\n");break;case 11:printf("Try between 1 and 10.You wasted your guess.\n");default:printf("Sorry,you lose.\n");break;}return 0; }

?執(zhí)行結(jié)果顯示如下：

[root@J01051386 Test_20180418]# gcc switch.c [root@J01051386 Test_20180418]# ./a.out Pick a number between 1 and 10 and you may win a prize:3 Sorry,you lose. [root@J01051386 Test_20180418]# ./a.out Pick a number between 1 and 10 and you may win a prize:7 You win the collected works of Amos of Amos Gruntfuttock.

總結(jié)

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