如何强制用户输入正整数？ [英] How do I force user to input a positive integer?

问题描述

强制用户输入正整数，并将用户置于循环中，直到它们成功。

Force user to input a positive integer and put user in a loop till they do.

因此，我希望一切都包括不允许超过> 0

So I want everything including characters not allowed just over > 0

我尝试了以下操作：

while (i < 0) do { 
    printf("please input a number that's positive"); 
    scanf("%d", i); 
}

推荐答案

int i;
do 
{ 
  printf("please input a number that's positive"); 
  scanf("%d", &i); 
}while (i < 0); 

c语言不提供用户输入的错误检查。用户需要输入正确的数据类型。例如，如果用户在期望整数值时输入字符，则程序可能进入无限循环或异常中止。

The c language provides no error checking for user input. The user is expected to enter the correct data type. For instance, if a user entered a character when an integer value was expected, the program may enter an infinite loop or abort abnormally.

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