Displaying a Return Value

[Kelli Cain]

I am working on a program to have a user input two positive integers and then finding the greatest common denominator between the two. My problem is, I don't know how to display the number (num2) that is returned after the method. Putting a simple System.out.println gives me the error "unreachable code". Any thoughts would be greatly appreciated. Thank you in advance!

 import java.util.Scanner;

public class **** 
{
	public static void main(String[] args) 
	{
		Scanner stdIn=new Scanner(System.in);
		int num1; //first number input by user
		int num2; //second number input by user
		
		System.out.println("Please enter a positive number: ");
		num1=stdIn.nextInt();
		//enter validation steps for positive number; must be numeric; must be integer
	//	while (num1 < 0) 
	//	{
	//		System.out.println("That is not a valid entry, please try again. ");
	//		num1=stdIn.nextInt();
	//	}//end while
		
		System.out.println("Please enter a positive number: ");
		num2=stdIn.nextInt();
	}
	static public int GCD (int num1, int num2)
		{
			int remainder = -1;
			int quotient;
			
			while (remainder != 0)
			{
				quotient=num1/num2;
				remainder=num1-quotient*num2;
				if (remainder != 0)
				{
					num1=num2;
					num2=remainder;
				}//end if
			}//end while
			return num2;
			System.out.println ("GCD is: "+num2);
		}//end GCD
	
	}

[Bear Bibeault]

Code after a return cannot be executed. That's what return means: stop the method and return the value. That's why code placed after it cannot be reached.

So, either move the display code to before the return, or in the calling method after the method call.

[Campbell Ritchie]

And welcome to the Ranch

[Ron McLeod]

You have a method to determine the largest common denominator, but are never calling it. Also, you should be printing the result from the main method, not the method running the algorithm. For example:

public static void main(String[] args) {
    Scanner stdIn = new Scanner(System.in);
    int num1; // first number input by user
    int num2; // second number input by user

    System.out.println("Please enter a positive number: ");
    num1 = stdIn.nextInt();

    System.out.println("Please enter a positive number: ");
    num2 = stdIn.nextInt();

    System.out.println("GCD is: " + GCD(num1, num2));
}

static public int GCD(int num1, int num2) {
    int remainder = -1;
    int quotient;

    while (remainder != 0) {
        quotient = num1 / num2;
        remainder = num1 - quotient * num2;
        if (remainder != 0) {
            num1 = num2;
            num2 = remainder;
        }// end if
    }// end while
    return num2;
}// end GCD

[Kelli Cain]

Thank you all, got it! Now once I figure out how to validate whether or not the entered values are integers and not doubles/other characters I'll be good to go! Off to search...