A Simple Calculator Class

Introduction

This article shows how to create a new class and call its member functions from Main progrmam. CalCulator is a class which has some member functions such as Square, Add, Subtract, Multiply etc.

using System;

/// <summary>
/// Summary description for Calculator.
/// </summary>
public class Calculator
{
    // Square function
    public int Square(int num)
    {
        return num * num;
    }

    // Add two integers and return the sum
    public int Add(int num1, int num2)
    {
        return num1 + num2;
    }

    // Add two doubles and return the sum
    public double Add(double num1, double num2)
    {
        return num1 + num2;
    }

    // Multiply two integers and return the result
    public int Multiply(int num1, int num2)
    {
        return num1 * num2;
    }

    // Subtract the smaller number from the larger one
    public int Subtract(int num1, int num2)
    {
        if (num1 > num2)
        {
            return num1 - num2;
        }

        return num2 - num1;
    }
}

/// <summary>
/// This shows how to use Calculator class from the Main C# program.
/// </summary>
public class Program
{
    static void Main()
    {
        Calculator calculator = new Calculator();

        Console.WriteLine(calculator.Square(8).ToString());
        Console.WriteLine(calculator.Add(8.3, 9.24).ToString());
        Console.WriteLine(calculator.Multiply(5, 8).ToString());
        Console.WriteLine(calculator.Subtract(22, 42).ToString());
    }
}

Build and run the application.