gradesMarks.java

import java.util.*;
public class gradesMarks
{
    public static void main(String args[])
    {
        int m1,m2,m3;
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter marks of 3 Subjects");
        m1=sc.nextInt();
        m2=sc.nextInt();
        m3=sc.nextInt();
        float avg=(float)(m1+m2+m3)/3;
        if(avg>=70)
        {
            System.out.println("Grade A");            
        }       
        else if (avg>=60 && avg<70)
        {
            System.out.println("Grade B");
        }
        else if (avg>=50 && avg<60)
        {
            System.out.println("Grade C");
        }
        else if (avg>=40 && avg<50)
        {
            System.out.println("Grade D");
        }
        else
        {
            System.out.println("Fail");
        }
    }
}