#include<stdio.h>
#define SIZE 10
float ave(float * start,float * end);
int main(void)
{
    float mark1[SIZE]={78,85,89,87,58,98,74,85,98,65};
    float mark2[SIZE]={98,58,98,94,96,85,86,84,84,96};
    float mark3[SIZE]={89,68,68,78,85,84,86,84,82,89};

    double n1,n2,n3;

    n1 = ave(mark1,mark1 + SIZE);
    n2 = ave(mark2,mark2 + SIZE);
    n3 = ave(mark3,mark3 + SIZE);

    printf("三组的平均成绩为：%2.1f %2.1f %2.1f\n",n1,n2,n3);
    return 0;
}

float ave(float * start,float * end)
{
    float ave,total;

    while(start < end)
    {
        total += * start;
        start++;
    }
    ave = total/SIZE;
    return ave;
}