java program to read no, name, sex and percentage and display grade.

import java.io.*;
class student
  {
       public static void main(String args[]) throws IOException
        {
          int rno;
          String name,sex,grade;
          double percentage;
          BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
          String in;




          System.out.print("Enter Roll No :");
          rno=Integer.parseInt(br.readLine());
          System.out.print("Enter Name :");
          name=br.readLine();
          System.out.print("Enter Sex :");
          sex=br.readLine();
          System.out.print("Enter percentage :");
          in=br.readLine();
          percentage=new Double(in).doubleValue();
          System.out.println("Roll No :"+rno);
          System.out.println("Name    :"+name);
          System.out.println("Sex     :"+sex);
          System.out.println("Percentage:"+percentage);
          if(percentage>=80)
             grade="A";
          else if(percentage>=70)
             grade="B";
          else if(percentage>=60)
             grade="C";
          else
             grade="D";
          System.out.println("Grade :"+grade);
        }
   }