Demonstrate a static class. : static Class « Class « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Class
3. static Class

using System;  
  
static class MathFunction {  
  // Return the reciprocal of a value. 
  static public double reciprocal(double num) { 
    return 1/num; 
  } 
 
  // Return the fractional part of a value. 
  static public double fracPart(double num) { 
    return num - (int) num; 
  } 
 
  // Return true if num is even. 
  static public bool isEven(double num) { 
    return (num % 2) == 0 ? true : false; 
  } 
 
  // Return true of num is odd. 
  static public bool isOdd(double num) { 
    return !isEven(num); 
  } 
 
}  
 
class MainClass {  
  public static void Main() {    
    Console.WriteLine("Reciprocal of 5 is " + 
                      MathFunction.reciprocal(5.0)); 
 
    Console.WriteLine("Fractional part of 4.234 is " + 
                      MathFunction.fracPart(4.234)); 
 
    if(MathFunction.isEven(10)) 
      Console.WriteLine("10 is even."); 
 
    if(MathFunction.isOdd(5)) 
      Console.WriteLine("5 is odd."); 
 
    // The following attempt to create an instance of  
    // MathFunction will cause an error. 
//  MathFunction ob = new MathFunction(); // Wrong! 
  }  
}

Reciprocal of 5 is 0.2
Fractional part of 4.234 is 0.234
10 is even.
5 is odd.