Java Assignment - Write Paint Program

import java.util.Scanner;

public class Paint {

    public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);
        double wallHeight = 0.0;
        double wallWidth = 0.0;
        double wallArea = 0.0;
        double gallonsPaintNeeded = 0.0;
        
        final double squareFeetPerGallons = 350.0;
        
        // Implement a do-while loop to ensure input is valid
        // Prompt user to input wall's height
        do{
        System.out.println("Enter wall height (feet): ");
        wallHeight = scnr.nextDouble();
        }while(wallHeight<=0);

        // Implement a do-while loop to ensure input is valid
        // Prompt user to input wall's width
        do{
        System.out.println("Enter wall width (feet): ");
        wallWidth = scnr.nextDouble();
        }while(wallWidth<=0);

        // Calculate and output wall area
        wallArea = wallHeight * wallWidth;
        System.out.println("Wall area: " + wallArea + " square feet");

        // Calculate and output the amount of paint (in gallons) needed to paint the wall
        gallonsPaintNeeded = wallArea/squareFeetPerGallons;
        System.out.println("Paint needed: " + gallonsPaintNeeded + " gallons");

    }
}