#include <stdio.h>
#include <stdarg.h>
 
double average(int num, int *array) {
 
   double sum = 0.0;
   int i;
 
   for (i = 0; i < num; i++) {
      sum += array[i];
   }
 
   return sum/num;
}
 
int main() {
 
   int a[] = {2,3,4,5};
   int b[] = {5,10,15};
   int size = 0;
 
   size = sizeof(a) / sizeof(a[0]);
 
   printf("Average of 2, 3, 4, 5 = %f\n", average(size, a));
 
   size = sizeof(b) / sizeof(b[0]);
   printf("Average of 5, 10, 15 = %f\n", average(size, b));
}

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