Factorial calculation C# with Example



Factorial calculation C# with Example

The factorial of a number (denoted with !, as for instance 9!) is the multiplication of that number with the factorial of 
one lower. So, for instance, 9! = 9 x 8! = 9 x 8 x 7! = 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1. 
So in code that becomes, using recursion: 
long Factorial(long x) 
{ 
if (x < 1) 
{ 
throw new OutOfRangeException("Factorial can only be used with positive numbers."); 
} 
if (x == 1) 
{ 
return 1; 
} else { 
return x * Factorial(x - 1); 
} 
} 
 

This topic outlines some basic naming conventions used when writing in the C# language. Like all conventions, they 
are not enforced by the compiler, but will ensure readability between developers. 
For comprehensive .NET framework design guidelines, see docs.microsoft.com/dotnet/standard/design-guidelines. 

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