function and its invocation

classProgram { Public voidDayin () {Console.WriteLine ("Hollo World"); }        /// <summary>        ///Accumulate sum/// </summary>        /// <param name= "n" ></param>        /// <returns></returns>         Public intLeijia (intN) {intsum =0;  for(inti =1; I <= n;i++) {sum+=i; }            returnsum; }        /// <summary>        ///Enter a number to determine if it is prime/// </summary>        /// <param name= "n" ></param>        /// <returns></returns>         Public voidZhishu (intN) {intCount =0;  for(inti =1; I <= n;i++ )            {                if(n%i==0) {Count++; }            }            if(Count = =2) {Console.WriteLine ("Prime Number"); }            Else{Console.WriteLine ("not prime ."); }         }        /// <summary>        ///to find the factorial and its/// </summary>        /// <param name= "n" ></param>        /// <returns></returns>         Public voidJiecheng (intN) {intJiecheng =1; inthe =0;  for(inti =1; I <=n; i++) {Jiecheng*=i; He= he +Jiecheng; } Console.WriteLine ("Factorial is"+jiecheng+"Factorial and yes"+He); }        /// <summary>        ///scissors three innings and two wins/// </summary>        /// <param name= "a" ></param>        /// <param name= "B" ></param>         Public voidCaiquan () {intRenying =0; intDiannaoying =0;  for(inti =1; I <=3; i++) {Console.Write ("Please input people punch (0-scissors, 1-stone, 2-cloth) a="); intA =int.                Parse (Console.ReadLine ()); Random R=NewRandom (); intb = R.next (3); Console.WriteLine ("Computer Punch (0-scissors, 1-stone, 2-cloth) b="+b); if(A-B =1|| A-B =-2) {renying++; Console.WriteLine ("people win a game"); }                Else if(A = =b) {Console.WriteLine ("Draw"); I--; Continue; }                Else{diannaoying++; Console.WriteLine ("Computer wins a game"); }                if(Renying >=2) {Console.WriteLine ("three innings, two wins.");  Break; }                Else if(Diannaoying >=2) {Console.WriteLine ("three innings, two wins, computer wins .");  Break; }            }        }        //Main function        Static voidMain (string[] args) {             while(true)            {                NewProgram (). Dayin (); Console.WriteLine ("Please enter a positive integer"); intn =int.                Parse (Console.ReadLine ()); intJieguo =NewProgram (). Leijia (n);                Console.WriteLine (Jieguo); NewProgram (). Zhishu (n); NewProgram (). Jiecheng (n); NewProgram (). Caiquan ();            Console.ReadLine (); }        }    }

function and its invocation