Question

write a java program to make a calculator using switch case
CALCULATOR
addition
subtraction
multiplication
division​

Answer 1

this program, you'll learn to make a simple calculator using switch..case in Java. This calculator would be able to add, subtract, multiply and divide two numbers.

To understand this example, you should have the knowledge of the following Java programming topics:

Java switch Statement

Java Scanner Class

Example: Simple Calculator using switch Statement

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(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;

}

System.out.printf("%.1f %c %.1f = %.1f", first, operator, second, result);

}

}