Write a Java program to perform basic Calculator operations.

import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
System.out.print("Enter two numbers: ");
// nextDouble() reads the next double from the keyboard
double first = reader.nextDouble();
double second = reader.nextDouble();
System.out.print("Enter an operator (+, -, *, /): ");
char operator = reader.next().charAt(0);
double result;
//switch case for each of the operations
switch(operator)
{
case '+':
result = first + second;
break;
case '-':
result = first - second;
break;
case '*':
result = first * second;
break;
case '/':
result = first / second;
break;
// operator doesn't match any case constant (+, -, *, /)
 
 
default:
System.out.printf("Error! operator is not correct");
return;
}
//printing the result of the operations
System.out.printf("%.1f %c %.1f = %.1f", first, operator, second, result);
}
}