Program to print Grade

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Description:
This program in used to print grade of subject according to marks obtained by student.this program can be created by using else..if ladder. 

Program:

#include<stdio.h>
#include<conio.h>
main()
{
           int A;
           clrscr();
           printf("Marks obtained in Any Subject: ");
           scanf("%d",&A);
           if(A>=80<=100)
           {
                  printf("\nGrade is A");
           }
           else if(A>50&&A<80)
           { 
                  printf("\nGrade is B");
           }
           else
           { 
                  printf("\nGrade is C Fail");
           }
          getch();
}