Calculating Percentage & Grade

#include <stdio.h>

#include <conio.h>

void main()

{

        int sub1, sub2, sub3, sub4, sub5;

        float total, percentage;

        clrscr();

        printf("\n\n\n***Program to Calculate Grade***\n\n\n");

        printf("Enter the obtained marks of Subject 1 : ");

        scanf("%d",&sub1);

        printf("Enter the obtained marks of Subject 2 : ");

        scanf("%d",&sub2);

        printf("Enter the obtained marks of Subject 3 : ");

        scanf("%d",&sub3);

        printf("Enter the obtained marks of Subject 4 : ");

        scanf("%d",&sub4);

        printf("Enter the obtained marks of Subject 5 : ");

        scanf("%d",&sub5);

        total = sub1+sub2+sub3+sub4+sub5;

        percentage = ((float)total/500)*100;

        printf("\n\nYour Total marks is %.f",total);

        printf("\nYour Percentage is %.2f",percentage);

        if(percentage>40)

        {

                if(percentage>60)

                {

                        if(percentage>80)

                        {

                                printf("\nYour Grade is A.");

                        }

                        else

                        {

                                printf("\nYour Grade is B.");

                        }

                }

                else

                {

                        printf("\nYour Grade is C.");

                }

        }

        else

        {

                printf("\n\nHome Guidance is necessary.");

        }

        getch();

}