C# lang.

Question

The factorial of a nonnegative integer n is written n! (pronounced n factorial) and is defined as follows: n! = n · (n - 1) · (n - 2) · ... · 1 (for values of n greater than or equal to 1) and n! = 1 (for n = 0). For example 5! = 5 · 4 · 3 · 2 · 1 which is 120. Write an application that reads a nonnegative integer from an input dialog and computes and prints its factorial.

Vulpes · Answer

Try this: using System; class Program { static void Main() { while(true) { Console.Write(Enter non-negative integer or -1 to quit : ); int n; int.TryParse(Console.ReadLine() out n); if (n == -1) return; Console.WriteLine(The factorial of {0} is {1}
 n Factorial(n)); } } static long Factorial(int n) { if (n if (n long factorial = 1; for(int i = n; i >=2; i--) { factorial *= i; } return factorial; } }