Demonstrate a static class. : Static Class : Class C# Examples

    
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!  
    }    
}