#include <stdio.h>

int make_average(double *data, int num); 

int main(void) 
{ 
  double hairetu[10]={1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0}; 
  double average=0;

  average = make_average(hairetu,10); 
  printf("average=%lf",average);
  return 0;

}

int make_average(double *data, int num)
{ 
  int i; 
  double heikin = 0.0; 
  for( i=0;i<num;i++) {
    heikin+=data[i]; 
  } 
  return heikin/=num; 
}