Thread: Nested loop if statement help

Right now my code is generating half of what it is supposed to.

Program asks the user to enter a number from 1 to 10.

Enter 7

output will be $$$$$$$

I'm having issues with my if statement. Once you put in the wrong number it should ask for another number and so on.

If statement:

if( num < 1 || num > 10)
{
     System.out.print("The number you entered is invalid");
}

public static void main(String [] args)
    {
 
        Scanner keyboard = new Scanner(System.in);
 
        int num;
        int num_of_rows = 1;
 
        System.out.print("Enter a number from 1 to 10: ");
        num = keyboard.nextInt();
 
        for (int row = 1; row <= num_of_rows; row++)
        {
            for ( int column = 1; column <= num; column++)
            {
                System.out.print("$");               
            }     
        }  
        System.out.println();
        System.exit(0);
    }

Yes, that is correct.

So, a while loop would be the thing to use?

Not working, I may have done it wrong.

I enter 2 it prints out "$$" and the "The number you entered is invalid". Even if I enter 20 it says the same thing. But it doesn't ask for the user to enter another number.

My while loop

while(num < 1 || num > 10)
{
    // nested loop in here
    System.out.println("\nThe number you entered is invalid");
}

Originally Posted by KevinWorkman

Without an SSCCE I can only guess at what your code is doing. But in that while loop, I don't see a place where you're asking for user input.

public static void main(String [] args)
    {
        Scanner keyboard = new Scanner(System.in);
 
        int num = 0;
        int num_of_rows = 1;
 
        while(num < 1 || num > 10)
        {
            System.out.print("Enter a number from 1 to 10: ");
            num = keyboard.nextInt();
 
            for (int row = 1; row <= num_of_rows; row++)
            {
                for ( int column = 1; column <= num; column++)
                {
                    System.out.print("$");               
                } 
            }
           System.out.println("\nThe number you entered is invalid");
        }
 
        System.out.println();
        System.exit(0);
    }