Thread: please help with simple program!!!

hi, i have to write a program for my intro to programming class and i cant get this code to work the assignment is :

Write a program that prompts the user to enter two positive integers r1 and r2 and displays all numbers from 100 to 1000, ten per line, that are divisible by r1 and r2. Also, if the user doesn't enter a number from 100-1000, ask them to enter it again.

the code that i have wrote so far is:

import java.util.Scanner;
public class TheProject {
 
 
	public static void main(String[] args) 
	{
		Scanner keyboard = new Scanner(System.in);
 
		int r1, r2;
 
 
		System.out.println("Enter two positive numbers:");
		r1 = keyboard.nextInt();
		r2 = keyboard.nextInt();
 
		while (r1 > 0 && r2 > 0)
		{
		for (int number = 100; number <= 1000; number++)
		{
			if (number%r1 == 0 && number%r2 == 0)
 
				System.out.println(number);
 
		}
 
 
		}
 
 
	}
}

Originally Posted by clockworkworks

you need a conditional statement “if” not a while loop, you could use a recursive method by using if else , that will solve your problem or at least give you a start...

In an Intro to Programming class, I doubt that recursion has been covered.

As far as the program is concerned, you have a nested loop in which the outer loop, if r1 and r2 are both positive integers, will have stuck you in an infinite loop.

Make the while statement into an if-else statement, where the program re-asks the user for numbers if r1 and r2 are invalid, else the program executes normally.