C语言中的无限循环代码 [英] Infinite loop code in C

问题描述

在下面的程序中，我尝试输入1至100之间的数字，但是如果在a 'character'或"string"(如s或sova) >语句将创建一个无限循环.所以我尝试做.....当我输入字符串或字符时，它向我显示一条消息，例如输入了错误的值.请再次输入"，然后它将再次输入...
谢谢；

In the below program I try to input a number between 1 to 100 but if I enter a 'character' or "string" ( like s or sova ) during the execution time of scanf() statement it creates a infinite loop. so I try to do .... when I input a string or a character it shown me a message like "wrong value entered. enter again" and it will enter again...
Thanx;

#include<stdio.h>
int main()
{
    int a;
    scanf("%d",&a);
    while(!(a>=1&&a<=100))
    {
        printf("wrong value entered. enter again\n");
        scanf("%d",&a);
    }
    printf("you enter %d. Thanxz",a);
    return 0;
}

推荐答案

1. 您需要检查scanf
的返回值
2. 如果用户未输入整数，则需要使用输入. scanf函数将继续说不是整数，然后重试.因此，如果scanf返回0，则需要对其进行处理

1. You need to check the return value of scanf
2. If the user has not entered a integer, you need to eat the input. The scanf function will continually say not a integer, try again. So if scanf returns 0 you need to deal with it

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