JavaExamples/SimpleMathMethods at master · DougBennettDev/JavaExamples · GitHub

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/*This program shows defined methods for simple arithmetic*/


import java.util.Scanner;

public class MathMethods{
   /*Instead of using if and switch statements per the original program
     this program utilizes methods that will be called when the user
     enters the appropriate input
   */
   public static void Multiplication()// Multiplication method
   {
        int Num1Int, Num2Int;
        Scanner scnr = new Scanner(System.in);

        System.out.println("Multiplication");

        System.out.print("\nFirst Number: ");
        Num1Int = scnr.nextInt();

        System.out.print("\nSecond Number: ");
        Num2Int = scnr.nextInt();

        scnr.close();
        System.out.println("\nProduct: " + Num1Int + " x " + Num2Int + " = " + (Num1Int * Num2Int));

   }
   public static void Division()// Division method
   {
        int Num1Int, Num2Int;
        Scanner scnr = new Scanner(System.in);

        System.out.println("Division");

        System.out.print("\nFirst Number: ");
        Num1Int = scnr.nextInt();

        System.out.print("\nSecond Number: ");
        Num2Int = scnr.nextInt();

        scnr.close();
        System.out.println("\nQuotient: " + Num1Int + " / " + Num2Int + " = " + (Num1Int / Num2Int));
   }
   public static void Addition()// Addition method
   {

        int Num1Int, Num2Int;
        Scanner scnr = new Scanner(System.in);

        System.out.println("Addition");

        System.out.print("\nFirst Number: ");
        Num1Int = scnr.nextInt();

        System.out.print("\nSecond Number: ");
        Num2Int = scnr.nextInt();

        scnr.close();
        System.out.println("\nSum: " + Num1Int + " + " + Num2Int + " = " + (Num1Int + Num2Int));
   }
   public static void Subtraction()//Subtraction method
   {
        int Num1Int, Num2Int;
        Scanner scnr = new Scanner(System.in);

        System.out.println("Subtraction");

        System.out.print("\nFirst Number: ");
        Num1Int = scnr.nextInt();

        System.out.print("\nSecond Number: ");
        Num2Int = scnr.nextInt();

        scnr.close();
        System.out.println("\nDifference: " + Num1Int + " - " + Num2Int + " = " + (Num1Int - Num2Int));
   }
   public static void main(String[] args) //main program
   {

        String usrInput = "";
        Scanner scnr = new Scanner(System.in);

        System.out.println("This Program is a simple calculator utilizing user-defined methods");

        System.out.println("\nPlease Enter (M)ultiplication, (D)ivision, (A)ddition, or (S)ubtraction");
        usrInput = scnr.next();
        System.out.println(usrInput);


        if (usrInput.equals("A")|| usrInput.equals("a")){
            Addition();   //returns Addition method
        }
        else if (usrInput.equals("S")|| usrInput.equals("s")){
            Subtraction(); //returns Subtraction method
        }
        else if (usrInput.equals("D")|| usrInput.equals("d")){
            Division(); // returns Division Method
        }
        else if (usrInput.equals("M")|| usrInput.equals("m")){
            Multiplication(); // returns Multiplication method
        }
        else {
            System.out.println("Invalid Input"); //if user input is not predefined input
        }

        System.out.println();
        scnr.close();
    }
}