/*
 * Store student grades in an array, reading from an input data file.
 * Compute the average of the grades and find the number of grades
 * that are above average.
 * CISC105 07/11/2005
 * average.5.c
 */

#include<stdio.h>
#define MAXGRADES 200

int main() {
  float runningSum = 0;
  int grade = 0, aboveAvg = 0;
  int numGrades = 0;
  float average;
  int grades[MAXGRADES];
  int i;
  FILE *file_ptr;
  char input;

  file_ptr = fopen( "grades_nosent.txt", "r");

  if( file_ptr == NULL ) {
    printf("Error opening 'grades_nosent.txt'\n");
    exit(1);
  }

  fscanf( file_ptr, "%c", &input );

  while( fscanf( file_ptr, "%d,", &grade ) != EOF ) {
    grades[numGrades] = grade;
    runningSum += grade;
    numGrades++;
  }

  /* print the saved grades */
  printf("The saved grades:\n");
  for( i=0; i < numGrades; i++ ) {
    printf("%d\n", grades[i]);
  }

  if( numGrades > 0 ) {
    average = runningSum/numGrades;
    printf("The average of %d grades is %.2f\n", numGrades, average);
  }
  else {
    // no point in doing anything else, so exit
    printf("No grades entered.");
    exit( 1 );
  }

  /*
   * Compute the number of grades that are above average.
   */
  for ( i=0; i < numGrades; i++ ) {
    if( grades[i] > average ) {
      aboveAvg++;
    }
  }
  
  printf("%d grades are above average.\n", aboveAvg );

  return 0;
}