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一个 switch 语句允许测试一个变量等于多个值时的情况。每个值称为一个 case,且被测试的变量会对每个 switch case 进行检查。
流程图
//下面的语句是由用户输入的char变量值来控制
#include <stdio.h>
int main(void)
{
char answer = 0;
printf("Enter Y or N:");
scanf(" %c",&answer);
switch(answer)
{
//可以把多个case值与一组语句联系起来
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语句中的case顺序是可任意的,default不一定是最后一个case
* */
//输入1-10内的任意数字;各别数字对应对应不同的提示信息,有些数字没有。
#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;
}
执行结果显示如下:
[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.