Basic Arithmetic Expressions in Java

JavaExpressionsHW.java

/**
 * Basic Expressions
 *
 * @author Sean Davis
 */

package edu.umsl;

import java.util.Scanner;

/**
 * Given values for 'x' and 'y', do basic arithmetic and output the results
 */
public class JavaExpressionsHW {

    // Assign value to x
    int x = 10;

    // Assign value to y
    int y = 20;

    // Declare z
    int z;

    public static void main(String[] args) {

        // A new instance of the class
        JavaExpressionsHW expressions = new JavaExpressionsHW();

        // Call program heading method
        expressions.programHeading();

        // Run all the calculations separately using x and y fields
        expressions.calcSum();
        expressions.calcDifference();
        expressions.calcProduct();
        expressions.calcQuotient();
        expressions.calcRemainder();

        // Now take user input for x and y and run the calculations again
        expressions.userInput();
    }

    // Output the program heading
    public void programHeading() {
        System.out.println("Where 'x' equals " + x + " and 'y' equals " + y + ", the following statements are true:");
    }

    public void userInput() {

        System.out.println("\nNow let's use custom values for 'x' and 'y'.\n");

        Scanner input = new Scanner(System.in);

        System.out.print("Enter a value for x: ");
        x = input.nextInt();

        System.out.print("Enter a value for y: ");
        y = input.nextInt();

        System.out.println("\nWhere 'x' equals " + x + " and 'y' equals " + y + ", the updated statements are true:");

        calcSum();
        calcDifference();
        calcProduct();
        calcQuotient();
        calcRemainder();
    }

    // Output the sum of x and y
    public void calcSum() {
        z = x + y;
        System.out.println("- The sum of " + x + " and " + y + " is " + z + ".");
    }

    // Output the difference between x and y
    public void calcDifference() {
        z = x - y;
        System.out.println("- The difference between " + x + " and " + y + " is " + z + ".");
    }

    // Output the product of x and y
    public void calcProduct() {
        z = x * y;
        System.out.println("- The product of " + x + " and " + y + " is " + z + ".");
    }

    // Output the quotient of x and y
    public void calcQuotient() {
        z = x / y;
        System.out.println("- The quotient of " + x + " and " + y + " is " + z + ".");
    }

    // Output the remainder of x and y
    public void calcRemainder() {
        z = x % y;
        System.out.println("- The remainder of " + x + " and " + y + " is " + z + ".");
    }
}