Program to print total marks, average and grade

Program to accept rollnumber and marks of three subjects from user and print total marks, average and grade.

#include
#include
void main()
{
  int RollNum, s1, s2, s3, total;
  float avg;
  clrscr();
  printf("Enter Roll Number : ");
  scanf("%d",&RollNum);
  printf("Enter marks for three subjects : ");
  scanf("%d%d%d", &s1, &s2, &s3);

  total=s1+s2+s3;
  avg=total/3.0;

  printf("\nTotal is : %d", total);
  printf("\nAverage is : %5.2f", avg);

  if(avg>80)
    printf("\nGrade : A");
  else if((avg>60)&&(avg<=80))
    printf("\nGrade : B");
  else if((avg>40)&&(avg<=60))
    printf("\nGrade : C");
  else if((avg>=33)&&(avg<=40)
    printf("\nGrade : D");
  else
    printf("\nGrade : Fail");

getch();
}