无法弄清楚如何使用的getchar（）;用C [英] Cannot figure out how to use getchar(); in C

问题描述

#include <stdio.h>
int main(void)

{
    char F,C;

    printf("Do you have a Fever? y/n\n");
    F = getchar();

    printf("Do you have a runny nose or cough? y/n\n");
    C = getchar();


    printf("Here are the results you input:\n");
    printf("Do you have a fever?");
    putchar(F);

    printf("\nDo you have a runny nose or cough?");
    putchar(C);

    return 0;
}

这首的getchar的code的输入结果（）; ，然后退出，而无需等待更多的输入。这是为什么？

The code inputs results from first getchar(); and then exits without waiting for more input. Why is that?

推荐答案

使用，而循环每个的getchar后（）如果您想只处理一个字符

Use a while loop after each getchar() if you want to process only one character

printf("Do you have a Fever? y/n\n");
F = getchar();
while((F = getchar()) != EOF && F != '\n') // This will eat up all other characters
    ;

printf("Do you have a runny nose or cough? y/n\n");
C = getchar();
while((C = getchar()) != EOF && C != '\n')
    ;

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