c++ - 阅读和检查字符问题

Question

这是我的代码

#include<stdio.h>

int main()
{

    char choice;

    printf("Do you want to enter a number:");
    scanf("%c",&choice);

    while(choice == 'y')
    {
      printf("Entered number\n");
      printf("Do you want to enter a number:");
      scanf("%c",&choice);


    }

    printf("End\n");

return 0;
}

输出是

Do you want to enter a number:y
Entered number
Do you want to enter a number:End

第一次，它检查我的字符是否是'y'，但在第一次执行后的循环中，它不等待用户输入，它只是终止循环。可能出了什么问题？请帮忙

Answer 1

看看 - http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1044873249&id=1043284392

#include<stdio.h>

int main()
{
    char choice;

    printf("Do you want to enter a number:");
    scanf("%c",&choice);

    while (choice == 'y')
    {
        while ((choice = getchar()) != '\n' && choice != EOF);
        printf("Entered number\n");
        printf("Do you want to enter a number:");
        scanf("%c",&choice);
    }

    printf("End\n");

    return 0;
}

请勿使用:fflush Why fflush(stdin) is wrong