Factorial Program in C#: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example:
4! = 4*3*2*1 = 24 6! = 6*5*4*3*2*1 = 720
Here, 4! is pronounced as "4 factorial", it is also called "4 bang" or "4 shriek".
The factorial is normally used in Combinations and Permutations (mathematics).
Let's see the factorial program in C# using for loop.
using System;
public class FactorialExample
{
public static void Main(string[] args)
{
int i,fact=1,number;
Console.Write("Enter any Number: ");
number= int.Parse(Console.ReadLine());
for(i=1;i<=number;i++){
fact=fact*i;
}
Console.Write("Factorial of " +number+" is: "+fact);
}
} Enter any Number: 6
Factorial of 6 is: 720
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.