do the easy stuff first.

welcome function, etc.
Code:
void reportSummary(int numStudents, int numInGoodStanding);
you'll need another loop inside your loop to do this:
Hours and grade (0 0 to end)? 3 2
Hours and grade (0 0 to end)? 3 2
Hours and grade (0 0 to end)? 4 3
Hours and grade (0 0 to end)? 0 0
Code:
int Comp_Grade(char grade) {

  if (grade == 'A')
    return 4;
  else if (grade == 'B')
    return 3;
  else if (grade == 'C')
    return 2;
  else if (grade == 'D')
    return 1;
  else if (grade == 'F')
    return 0;
  else
    return -1;
    system("pause"); //never reaches here.
    return 1; //
}