用C语言写出：
输入班级学生考试成绩，求考试平均成绩。假定当输入负数时，表示输入结束

谢谢

这个还要别人写啊 ！

#include<stdio.h>
main()
{int n;float ave=0;
printf("please input the number");
scanf("%d",&n);
for
(
int i=1,score;
i<=n;
i++
)
{printf("the No.%dis",i);
scanf("%d",&score);
ave+=score;
}
ave/=n;
printf("the ave is%f",ave);}

#include<stdio.h>
main()
{int n,i,score;float ave=0;
printf("please input the number:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{printf("the No.%dis",i);
scanf("%d",&score);
ave+=score;
}
ave/=n;
printf("the ave is%f",ave);}  这才是对的

谢谢各位，

我试了下，不管用啊。你的n,一会表示成绩，一会又变成了for循环的判断条件。不懂

#include <stdio.h>
#define NR 100
int main(void)
{
        int array[NR];
        int num,i;
        float result;
        printf("Input the number of student: \n");//输入人数
        scanf("%d",&num);
        printf("Input the score: \n");//输入数据
        for (i = 0; i <num; i++)
                scanf("%d",&array[i]);
        for (i = 0; i <num; i++)//求平均
                result += array[i];
        printf("%f",result/num);
}

#include <stdio.h>
int main(void)
{
        int data,num = 0;
        float result;
        printf("Input score: \n");
        while (1) {
                scanf("%d",&data);
                if (data < 0)
                        break;
                result += data;
                num += 1;
        }
        printf("%3.2f",result/num);
}
刚忘了加入负数终止的条件，请不要见怪！这个补上！