10.c#--function parameter, parameter array, value transfer function, reference transfer function, output function, parameterless function

Using system;using system.collections.generic;using system.linq;using system.text;using  system.threading.tasks;namespace consoleapplication1{    class program{         static int val;         //function         //1.  keyword static: static function, void: no return value, Return: The program returns the calling code immediately;         //instance 1:  function Parameters          static double product (DOUBLE PARAM1, DOUBLE PARAM2) {             RETURN PARAM1 * PARAM2;}         //Instance 2:  parameter array          static int add (params int[] p) {             int sum = 0;            foreach  (int i in  P)             sum += i;             return sum;}         //instance 3:  value transfer function, the result does not change          static void showdoulbe (Int val) {             val *= 2;             console.writeline ("val doubled ={0}",  val);}         //instance 4:  no parameter function, result change          static void showdoulbe () {             val *= 2;            conSole. WriteLine ("val doubled ={0}",  val);}         //Instance 5:  Reference transfer function, result change          static void showdoulbe (Ref int val) {             val *= 2;             console.writeline ("val doubled ={0}",  val);}         //instance 6:  output function          static void outfun (OUT STRING STR) {             str =  "Test";             str +=  "Fun";             Console.WriteLine ("Outfun result: {0}",  str);}         static&nbSp;void main (String[] args) {             Call function Parameter             console.writeline ("Call  func parameter; ");             double a = product (1.2,  2.1);             console.writeline (a);             //Call parameter array              console.writeline ("call parameter array;");             int sum = add (1, 3 ,  5, 7);             console.writeline ( sum);             //call no parameter function, result change       &Nbsp;      console.writeline ("call non-parameter func;");             val = 5;             console.writeline ("befor the call;");             console.writeline ("myNumber={0}",  val);             console.writeline ("After  the call; ");             showdoulbe ();             console.writeline ("mynumber={0}",  val);             //Call value transfer function, result does not change              console.writeline ("call value-passed func;");             int mynumber = 5;             console.writeline ("befor the call;");             console.writeline ("myNumber={0}",  mynumber);             console.writeline (" after the call; ");             showdoulbe (MyNumber);             console.writeline ("myNumber={0}",  myNumber);             //Invoke reference transfer function, result change              console.writeline ("call reference-passed func;");             int myNumber2 = 5;        &nBsp;    console.writeline ("befor the call;");             console.writeline ("myNumber={0}",  MYNUMBER2);             console.writeline (" after the call; ");             showdoulbe (Ref myNumber2);             console.writeline ("myNumber={0}",  MYNUMBER2);             //Call output function              console.writeline ("call out parameter  function; ");             string test2;             outfun (OUT TEST2);          &nbSp;  console.readline ();}}}　　　 

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10.c#--function parameter, parameter array, value transfer function, reference transfer function, output function, parameterless function