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guessing a number program

 import java.util.Scanner;


class Guessnum{

    public static void main(String[] args)
    {
        int num = (int) (Math.random()*100);

        Scanner sc = new Scanner(System.in);
        int guess;
        //System.out.println(num);

        System.out.println("if you want to stop enter negative number\n");
       
        do {

            System.out.print("enter the number : ");

             guess = sc.nextInt();

            //System.out.println(guess);

            if ( guess == num)
            {
                System.out.println("hurray you guessed it correct");

                break;
            }
           
            else if (guess <0)
            {
                System.out.println("thanku for playing");

                break;
            }

            else if (guess > num)
            {
                System.out.println("your number is large");
            }
           
            else if (guess < num)
            {
                System.out.println("your number is small");
            }
           

        }while(guess != 0 );

        System.out.println("have a great day");
    }

}

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