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  1. using System;
  2.  
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 		Factorial(1000);
  8. 	}
  9.     public static void Factorial(int n)
  10.     {
  11.         var number = new int[999999];
  12.         number[0] = 1;
  13.         int numLength = 1;
  14.         for (int times = 2; times <= n; times++)
  15.             numLength = Multiply(times, number,numLength);
  16.  
  17.         for (int i = numLength - 1; i >= 0; i--)
  18.             Console.Write(number[i]);
  19.     }
  20.  
  21.  
  22.     static int Multiply(int times, int[] number,int numLength)
  23.     {
  24.         int carry = 0; 
  25.         for (int i = 0; i < numLength; i++)
  26.         {
  27.             int product = number[i] * times + carry;
  28.             number[i] = product % 10;
  29.             carry = product / 10;
  30.         }
  31.  
  32.         while (carry != 0)
  33.         {
  34.             number[numLength] = carry % 10;
  35.             carry /= 10;
  36.             numLength++;
  37.         }
  38.         return numLength;
  39.     }
  40. }
Success #stdin #stdout 0.04s 22260KB
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stdin
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Standard input is empty
stdout
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402387260077093773543702433923003985719374864210714632543799910429938512398629020592044208486969404800479988610197196058631666872994808558901323829669944590997424504087073759918823627727188732519779505950995276120874975462497043601418278094646496291056393887437886487337119181045825783647849977012476632889835955735432513185323958463075557409114262417474349347553428646576611667797396668820291207379143853719588249808126867838374559731746136085379534524221586593201928090878297308431392844403281231558611036976801357304216168747609675871348312025478589320767169132448426236131412508780208000261683151027341827977704784635868170164365024153691398281264810213092761244896359928705114964975419909342221566832572080821333186116811553615836546984046708975602900950537616475847728421889679646244945160765353408198901385442487984959953319101723355556602139450399736280750137837615307127761926849034352625200015888535147331611702103968175921510907788019393178114194545257223865541461062892187960223838971476088506276862967146674697562911234082439208160153780889893964518263243671616762179168909779911903754031274622289988005195444414282012187361745992642956581746628302955570299024324153181617210465832036786906117260158783520751516284225540265170483304226143974286933061690897968482590125458327168226458066526769958652682272807075781391858178889652208164348344825993266043367660176999612831860788386150279465955131156552036093988180612138558600301435694527224206344631797460594682573103790084024432438465657245014402821885252470935190620929023136493273497565513958720559654228749774011413346962715422845862377387538230483865688976461927383814900140767310446640259899490222221765904339901886018566526485061799702356193897017860040811889729918311021171229845901641921068884387121855646124960798722908519296819372388642614839657382291123125024186649353143970137428531926649875337218940694281434118520158014123344828015051399694290153483077644569099073152433278288269864602789864321139083506217095002597389863554277196742822248757586765752344220207573630569498825087968928162753848863396909959826280956121450994871701244516461260379029309120889086942028510640182154399457156805941872748998094254742173582401063677404595741785160829230135358081840096996372524230560855903700624271243416909004153690105933983835777939410970027753472000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
https://ideone.com/orHbDH
language:
C# (gmcs 5.20.1)
created:
2 years ago
visibility:
public

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