在 C 中创建一个函数，如果输入 "q"，该函数就会退出

Question

我必须编写一个没有参数并返回 int 值的函数。该函数要求用户输入“q”或“Q”才能退出。如果输入任何其他字符，程序将继续。

Answer 1

这是实现我认为你所说的内容的一种方法。

#include<stdio.h>
#include<stdlib.h> /* The library that is needed for the function exit() */
    int get_your_char(void);
    int main(void)
    {
            int x =get_your_char(); /* Here you call your function and you assign the returned integer to x */
            printf("%d",x);
            return 0;
    }
    int get_your_char(void)
    {
            char ch;
            int your_value=666; /* Let's assume that this is the value that you want to return if the user won't quit */
            ch=getchar(); /* Here you read the charachter */
            if(ch == 'q' || ch == 'Q')
                    exit(EXIT_SUCCESS); /* EXIT_SUCCESS usually is the value 0(zero) and makes the program terminate normally*/
            else
                    return your_value;
    }