c语言中do语句读取一定范围内的值

 

1、

#include <stdio.h>

int main(void)
{
    int i;
    do
    {
        puts("please input value of i (0/1/2)");
        printf("i = "); scanf("%d", &i);
    }
    while (i < 0 || i > 2);
    switch (i)
    {
        case 0 : puts("you had choosen stone!"); break;
        case 1 : puts("you had choosen scissors!"); break;
        case 2 : puts("you had choosen cloth!"); break;
    }
    return 0;
}

 

#include <stdio.h>

int main(void)
{
    int i;
    do
    {
        puts("please input value of i(0/1/2)");
        printf("i = "); scanf("%d", &i);
    }
    while (!(i >= 0 && i <= 2));
    switch (i)
    {
        case 0 : puts("you had choosen stone!"); break;
        case 1 : puts("you had choosen scissors!"); break;
        case 2 : puts("you had choosen cloth!"); break;
        default : puts("error!"); break;
    }
    return 0;
}