40 lines
871 B
C#
40 lines
871 B
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace ConsoleApp2
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{
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public static class Intkiterjesztesek
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{
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public static int Factorial(this int szam)
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{
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if (szam < 0) {
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throw new ArgumentException("A negatív számoknak nincs faktoriálisa");
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}
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if (szam == 0 || szam == 1)
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{
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return 1;
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}
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int result = 1;
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for (int i = 2; i <= szam; ++i) {
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result *= i;
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}
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return result;
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}
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}
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class Program
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{
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static void Main(string[] args)
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{
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int szam = 5;
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int factorial = szam.Factorial();
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Console.WriteLine($"{szam}! = {factorial}");
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}
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}
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}
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