Build a Simple Java Calculator: Unlocking the Power of Java Programming

Unlock the Power of Java: Creating a Simple Calculator

Are you ready to tap into the versatility of Java programming? Let’s get started with a hands-on example that will take your coding skills to the next level!

Gathering User Input

When you run the program, the output will reveal the secrets of efficient data collection. The user-inputted operator is stored in the operator variable using the next() method of the Scanner object. Meanwhile, the two operands, 1.5 and 4.5, are stored in variables first and second respectively using the nextDouble() method of the Scanner object.

The Switch Statement: A Game-Changer

Now, let’s dive into the heart of the program – the switch statement. Since the operator * matches the when condition '*', the control of the program jumps to the corresponding block. This statement calculates the product and stores it in the variable result, which is then printed using the printf statement.

The Java Code: A Simple Yet Powerful Calculator

Here’s the equivalent Java code that brings it all together:
“`java
import java.util.Scanner;

public class SimpleCalculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);

    System.out.println("Enter an operator (+, -, *, /): ");
    char operator = scanner.next().charAt(0);

    System.out.println("Enter number 1: ");
    double first = scanner.nextDouble();

    System.out.println("Enter number 2: ");
    double second = scanner.nextDouble();

    double result;

    switch (operator) {
        case '+':
            result = first + second;
            break;
        case '-':
            result = first - second;
            break;
        case '*':
            result = first * second;
            break;
        case '/':
            result = first / second;
            break;
        default:
            System.out.println("Invalid operator!");
            return;
    }

    System.out.printf("%.2f %c %.2f = %.2f", first, operator, second, result);
}

}
“`
With this simple yet powerful calculator, you’ve taken the first step in unlocking the full potential of Java programming. So, what’s next? The possibilities are endless!