Assignemnt #97 and Area Calculator

Code

import java.util.Scanner;

public class AreaCalculator
{
    public static void main(String[] args)
    {
        Scanner keyboard = new Scanner(System.in);
        int choice;
        System.out.println("Shape Area Calculator version 0.1 (c) 2016 Chung Inc. " );
        System.out.println();
            
        do 
        {
            System.out.println("-=-=-=-=-=-=-=-=-=-=-=-=-=-=-");
            System.out.println();
            System.out.println("1) Triangle");
            System.out.println("2) Rectangle");
            System.out.println("3) Square" );
            System.out.println("4) Circle" );
            System.out.println("5) Quit");
            System.out.print("Which Shape: ");
            choice = keyboard.nextInt();
            System.out.println();
                
            if ( choice == 1 )
            {
                System.out.print("Base: ");
                int base = keyboard.nextInt();
                System.out.print("Height: ");
                int height = keyboard.nextInt();
                System.out.println();
                System.out.println("The area is " + triangleArea( base, height ) + "." );
            }
            else if (choice == 2)
            {
                System.out.print("Base: ");
                int base = keyboard.nextInt();
                System.out.print("Height: ");
                int height = keyboard.nextInt();
                System.out.println();
                System.out.println("The area is " + rectangleArea( base, height ) + "." );
            }
            else if (choice == 3)
            {
                System.out.print("Side length: ");
                int length = keyboard.nextInt();
                System.out.println();
                System.out.println("The area is " + squareArea( length ) + "." );
            }
            else if (choice == 4)
            {
                System.out.print("Radius: ");
                int radius = keyboard.nextInt();
                System.out.println();
                System.out.println("The area is " + circleArea( radius ) + "." );
            }
        }
        while( choice != 5 );
            
            System.out.println("Goodbye.");
    
    }
        
        public static double triangleArea( int base, int height )
        {
            double result;
            result = (base*height)/2.0;
            return result;
        }
        
        public static int rectangleArea( int base, int height )
        {
            int result;
            result = base*height;
            return result;
        }
        public static int squareArea( int length )
        {
            int result;
            result = length*length;
            return result;
        }
        public static double circleArea( int radius )
        {
            double result;
            result = Math.PI*(radius*radius);
            return result;
        }
}
 
    

Picture of the output