#include <stdio.h>
double fun(int a[],int n)
{
    int i,sum=0,count=0;
    for(i=0;i<n;i++)
    {
/**********found**********/
        if(___1___)
        {
/**********found**********/
            sum += ___2___;
            count++;
        }
/**********found**********/
        ___3___;
    }
    return (double)sum/count;
}
int main()
{
    int arr[]={-2,3,5,-7,8};
    int len=sizeof(arr)/sizeof(arr[0]);
    printf("avg=%.1f\n",fun(arr,len));
    return 0;
}