4. Input from keyboard

import java.util.*;

class nip

{

            public static void main(String ab[])

            {

                        Scanner sc=new Scanner(System.in);

                        int a,b,c;

                        System.out.println("a=");

                        a=sc.nextInt();

                        System.out.println("b=");

                        b=sc.nextInt();

                        c=a+b;

                        System.out.println("add="+c);

            }

}