A Simple Calculator Class


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;
// Creating a simple Calculator class
/// <summary>
/// Summary description for Class1.
/// </summary>
public class CalCulator
{
// Square function
public int Square(int num)
{
return num*num;
}
// Add two integers and returns the sum
public int Add(int num1, int num2 )
{
return num1 + num2;
}
// Add two integers and returns the sum
public double Add(double num1, double num2 )
{
return num1 + num2;
}
// Multiply two integers and retuns the result
public int Multiply(int num1, int num2 )
{
return num1 * num2;
}
// Subtracts small number from big number
public int Subtract(int num1, int num2 )
{
if ( num1 > num2 )
{
return num1 - num2;
}
return num2 - num1;
}
}
// This shows how to use CalCulator class from Main C# program.
public class Class1
{
static void Main()
{
CalCulator sq =
new CalCulator();
Console.WriteLine( sq.Square(8).ToString());
Console.WriteLine( sq.Add(8.3, 9.24).ToString());
Console.WriteLine( sq.Multiply(5,8).ToString());
Console.WriteLine( sq.Subtract(22, 42).ToString());
}
}

Build and run the application.