#include <stdio.h>
#include <ctype.h>

int main (void)
{
    char ifcontinue = "n";
    double value = 0.0;
    double average =0.0;
    double total = 0.0;
    int count = 1;


    for ( ; ; )
    {
        printf("\nyou can enter a number:");
        scanf("%lf",&value);
        total += value;
        ++count;

        printf("do you want to continue? (Y or N):");
        scanf("%c", &ifcontinue);

        if (tolower(ifcontinue) == 'n')
            break;
    }
    average = value/count;
    printf("/n you enter %d numbers, and the average is %lf", count ,average);
    return 0;
}

这是我自己编的,我感觉和课本的差不多啊,但是运行的时候 出现那个do you want to continue 以后也没出现要我填Y/N的地方,直接又回去了出现了you can enter a number,  求指点,谢谢

对对对,别人也指出说有这个错误,可是运行的时候软件确实没有提醒我,而且真的运行了,我没必要说谎啊,我用的是code block这个软件.  对,版主厉害,我改了一下是成功了,可是这是为什么呢?

好好,知道了,谢谢大家了