Answer to Question #308031 in Java | JSP | JSF for Hlo Makiwane

Question

PROGRAM 2 – Maths Calculator

Write a small application in JAVA that reads in two integers, and then asks the user to type in a character to indicate what calculation must be done with the two numbers, viz:

A to add

S to subtract

M to multiply

D to divide

Display the result of the calculation.

The output of sample runs of the program is given below (the text in bold was typed by the user).

Please use the SAME wording/messages/labels as shown.

Sample execution run 1 Sample execution run 2

Enter the first number: 27

Enter the second number: 9

What would you like to do?

A to add

S to subtract

M to multiply

D to divide

Enter choice: s

27 minus 9 is 18.

Enter the first number: 15

Enter the second number: 0

What would you like to do?

A to add

S to subtract

M to multiply

D to divide

Enter choice: D

**Error** Cannot divide by zero.

Answer 1

import java.util.Scanner;


class App {


	public static void main(String[] args) {
		Scanner keyBoard = new Scanner(System.in);
		System.out.print("Enter the first number: ");
		int number1 = keyBoard.nextInt();
		System.out.print("Enter the second number: ");
		int number2 = keyBoard.nextInt();
		System.out.println("What would you like to do?");
		System.out.println("A to add");
		System.out.println("S to subtract");
		System.out.println("M to multiply");
		System.out.println("D to divide");
		System.out.print("Enter choice: ");
		keyBoard.nextLine();
		char operation = keyBoard.nextLine().toUpperCase().charAt(0);
		double result = 0;
		if (operation == 'A') {
			result = number1 + number2;
			System.out.println(number1 + " plus " + number2 + " is " + result + ".");
		} else if (operation == 'S') {
			result = number1 - number2;
			System.out.println(number1 + " minus " + number2 + " is " + result + ".");
		} else if (operation == 'M') {
			result = number1 * number2;
			System.out.println(number1 + " times " + number2 + " is " + result + ".");
		} else if (operation == 'D') {
			if (number2 != 0) {
				result = number1 / number2;
				System.out.println(number1 + " by " + number2 + " is " + result + ".");
			} else {
				System.out.println("**Error** Cannot divide by zero.");
			}
		} else {
			System.out.println("Wrong operation\n");
		}


		keyBoard.close();
	}
}