#include <stdio.h>

double calcAverage(int grades [], int numGrades);

int main (int argc, char *argv[]) {

   const int MAX_STUDENTS = 50;
   const int PASS_LEVEL = 70;
   
   int grades[] = {42, 11, 100, 93, 70};
   int numGrades = 5;

   printf("the number of students is %d\n", numGrades);

   for (int i = 0; i < numGrades; i++) {
      printf("%d - %d ", i, grades[i]);
   
      if (grades[i] >= PASS_LEVEL) {
         printf(", Passing\n");
      }
      else {
         printf(", Failing\n");
      }
   }

   double average = calcAverage(grades, numGrades);
   printf("The average = %f\n", average);

   return 0;
}


double calcAverage(int grades[], int numGrades) {
   double average;
   int total = 0;

   for (int i = 0; i < numGrades; i++) {
      total = total + grades[i];   //the same as total += grades[i];
   }

   average = total / (double) numGrades;

   return average;
}