sub.java

import java.util.Scanner;


public class Sub {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		int number1=(int)(Math.random()*10);
		int number2=(int)(Math.random()*10);
		if(number1<number2){
			int temp=number1;
			number1=number2;
			number2=temp;
			
		}
		System.out.print
		("what is "+number1+"-"+number2+"?");
		Scanner input=new Scanner (System.in);
		int answer =input.nextInt();
		if(number1-number2==answer)
			System.out.println("You are correct!");
		else 
			System.out.println("YOU answer is wrong\n"+number1+"-"+number2+"should be"+(number1-number2));
		
			
			
		// TODO Auto-generated method stub

	}

}