及格不及格_各種成績相關計算

/* 懶得多寫一個版本了 把每個要算的都寫出來了*/
#include <stdio.h>

int main ()
{
    int num, failed_count=0, total_count=0, score[100], failed_sum=0, passed_sum=0;

    printf ("Please input scores (-1 to exit): ");

    while (1)
    {
        scanf ("%d", &num);
        if (num == -1) break;
        if (num < 60)
        {
            score[failed_count] = num;
            failed_count++;
            failed_sum += num;
        }
        else
            passed_sum += num;
        total_count++;
    }

    printf ("There are %d people in total, %d people failed, %d people passed.\n", total_count, failed_count, total_count-failed_count);
    printf ("The average score of failed people is %.2f, passed people is %.2f, all people is %.2f", (float)failed_sum/failed_count, (float)passed_sum/(total_count-failed_count), (float)(failed_sum+passed_sum)/total_count);

    return 0;
}