閱讀和檢查人品問題

Question

這是我的代碼

#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; 
} 

輸出功率爲

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

首次，它檢查了我的性格是「Y」，但在循環後第一它不會等待用戶輸入，而只是終止循環。可能出了什麼問題？請幫助

Answer 1

採取看看 - 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; 
} 

DONOT用途：fflushWhy fflush(stdin) is wrong