C program to check whether a student is pass or fail

#include<stdio.h>
#include<conio.h>
void main()
{
    int percentage;
    clrscr();
    printf("Enter Your Percentage: ");
    scanf("%d",&percentage);
    if(percentage<0 || percentage>100)
    {
        printf("Wrong Entry");
    }
    else if(percentage<40)
    {
        printf("Grade F \nSorry You're Fail! ");
    }
    else if(percentage>=40 && percentage<60)
    {
        printf("Grade D");
    }
    else if(percentage>=60 && percentage<70)
    {
        printf("Grade C");
    }
    else if(percentage>=70 && percentage<80)
    {
        printf("Grade B");
    }
	else if(percentage>=80 && percentage<90)
	{
		
		printf("Grade A");

	}
    else
    {

        printf("Grade E \nYou're Excellent!");

    }
	getch();
  }

Output-1:

Output-2: