请教C语言getchar（）问题

Question

#include<stdio.h>
int main(void)
{
    int guess = 1;
    char response;
    printf("Pick an integer from 1 to 100. I will try to guess ");
    printf("it.\nRespond with a y if my guess is right and with");
    printf("\nan n if it is wrong.\n");
    printf("Uh...is your number %d?\n", guess);
    while ((response=getchar()) != 'y')
    {
        if (response == 'n')
            printf("Well, then, is it %d?\n", ++guess);
        else
            printf("Sorry, I understand only y or n.\n");
        while (getchar() != '\n')
            continue;
    }
    printf("I knew I could do it!\n");

    return 0;
}

请教，这两个代码的区别是什么？如果输入no sir，getchar()是什么读取字符的，按照上面的代码，是while ((response=getchar()) != 'y')判断response=n，还是response=no sir？

#include<stdio.h>
int main(void)
{
    int guess = 1;
    char response;
    printf("Pick an integer from 1 to 100. I will try to guess ");
    printf("it.\nRespond with a y if my guess is right and with");
    printf("\nan n if it is wrong.\n");
    printf("Uh...is your number %d?\n", guess);
    while (getchar() != 'y')
    {
        printf("Well, then, is it %d?\n", ++guess);
        while (getchar() != '\n')
            continue;
    }
    printf("I knew I could do it!\n");

    return 0;
}

Answer 1

c语言的getchar是个大坑，初学者掉到坑里还爬不上来，关于这个函数我写过一篇文章，可以关注我找一下