easyProgramming Fundamentals

Switch Statements

Build a small calculator supporting addition, subtraction, and multiplication.

GeeksforGeeks ↗

Work through the cases

3 examples

Input notation

Two integers followed by an operator: +, -, or *.

Expected result

The calculated integer.

Case 1

Input

8 3 -

Expected output

Case 2

Input

4 6 *

Expected output

Case 3

Input

-4 6 +

Expected output

These notes use simplified input/output notation. The linked platform defines the method signature and judge format.

FROM IDEA TO IMPLEMENTATION

Understand the approach.

Compare the documented approaches below. Brute force, better, and optimal versions appear where available; a direct exercise may need only one approach.

Use the operator to choose addition, subtraction, or multiplication. Time and space: O(1).

import java.util.*;
public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); long x=in.nextLong(), y=in.nextLong(); String op=in.next(); switch(op){ case "+": System.out.println(x+y); break; case "-": System.out.println(x-y); break; case "*": System.out.println(x*y); } } }

Reference code. Platform solutions may use supplied node types, imports, or collection libraries; foundational examples are complete programs.