successful execution of program.

import java.util.Scanner;

class MCALCULA {
public static void main(String[] args) {

char operator;
Double number1, number2, result;

// create an object of Scanner class
Scanner input = new Scanner(System.in);

// ask users to enter operator
System.out.println("Choose an operator: +, -, *, or /");
operator = input.next().charAt(0);

// ask users to enter numbers
System.out.println("Enter first number");
number1 = input.nextDouble();

System.out.println("Enter second number");
number2 = input.nextDouble();

switch (operator) {

  // performs addition between numbers
  case '+':
    result = number1 + number2;
    System.out.println(number1 + " + " + number2 + " = " + result);
    break;

  // performs subtraction between numbers
  case '-':
    result = number1 - number2;
    System.out.println(number1 + " - " + number2 + " = " + result);
    break;

  // performs multiplication between numbers
  case '*':
    result = number1 * number2;
    System.out.println(number1 + " * " + number2 + " = " + result);
    break;

  // performs division between numbers
  case '/':
    result = number1 / number2;
    System.out.println(number1 + " / " + number2 + " = " + result);
    break;

  default:
    System.out.println("Invalid operator!");
    break;
}

input.close();

}
}