Write a mini-calculator program in Java programming language, the program should be able to prompt the user to enter the variables on which the operations have to be performed. It should also asks the user for the type of operation.

• Java Code

package sikademy;
/**
 *
 * @author Archangel Macsika
 */
import java.util.Scanner;

public class Calculator {

	public Calculator() {
	}

	private int firstnum = 0;
	private int secondnum = 0;
	private int result = 0;
	private int choice = 0;

	// This function is used to prompt user to enter the variables on which the operations have to be performed This function also asks the user for the type of operation

	public void prompt() {

		Scanner scan = new Scanner(System.in);
		System.out.println("Enter the first number:");
		firstnum = scan.nextInt();
		System.out.println("Enter the second number:");
		secondnum = scan.nextInt();
		
		System.out.println("Enter the choice:");
		System.out.println("1 for +");
		System.out.println("2 for -");
		System.out.println("3 for *");
		System.out.println("4 for /");
		System.out.println("5 for %");
		System.out.println("6 to Exit");
		choice = scan.nextInt();
		if (choice == 6) {
			System.out.println("Exiting System...");
			System.exit(0);
		}
		operate(firstnum, secondnum, choice);

	}

	private void operate(int first, int second, int choice) {

		switch (choice) {
		case 1:
			result = first + second;
			break;
			
		case 2:
			result = first - second;
			break;
			
		case 3:
			result = first * second;
			break;

		case 4:
			result = first / second;
			break;

		case 5:
			result = first % second;
			break;
			
		default:
			System.out.println("Please enter valid choice");
			prompt();
			break;

		}
		displayResult(result);
		prompt();
	}

	// This function displays the result

	private void displayResult(int result) {

		System.out.println("The result of the operation is : " + result);
	}

	public static void main(String[] args) {
		Calculator calc = new Calculator();
		calc.prompt();
	}
}