This post contains a total of 24+ Hand-Picked C# Factorial Calculator Examples with Source Code. All the Factorial Calculators are made using C Sharp Programming language.
You can use the source code of these programs for educational purpose with credits to the original owner.
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1. By Cody Sharp
Made by Cody Sharp. This is a simple C# factorial calculator based on array. In the INPUT, enter the number for which you want to get factorial. Then the program displays answer in the console. ( Source )
using System;
namespace SoloLearn
{
class FactorialCalc
{
public static double GetFactorial(int num)
{
double factorialNum = 1;
int[] numRange = new int[num];
for(int i = 0; i < numRange.Length; i++, num--)
numRange[i] = num;
foreach(int j in numRange) factorialNum *= (double)j;
return factorialNum;
}
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
Console.WriteLine($"The value of factorial of {num} is: " + GetFactorial(num));
}
}
}
2. By dynasteve16
Made by dynasteve16. It calculates the factorials of numbers. ( Source )
using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
namespace dynasteve16
{
public class OnWards
{
static int fact(int num){
if(num == 1){
return 1;
}else{
return num * fact(num - 1);
}
}
public static void Main(string[] args){
Console.WriteLine("Input your number to calculate factorial");
int x = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(fact(x));
Console.WriteLine("THANKS PLEASE LIKE AND FOLLOW ME");
}
}
}
3. By Cardstdani
Made by Cardstdani. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
long a;
long b;
long c = 0;
Console.WriteLine("The number is: ");
a = Convert.ToInt32(Console.ReadLine());
b = a;
for(int i = 1; i < a;i++)
{
b *= i;
}
Console.WriteLine(b);
}
}
}4. By Bart
Made by Bart. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static int Fact(int num)
{
if (num == 1)
{
return 1;
}
if (num != 2)
Console.Write(num+" * ");
else
Console.Write(num+" * 1 = ");
return num * Fact(num - 1);
}
static void Main(string[] args)
{
Console.WriteLine("Give us a number to factorial");
int x = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Factorial: ");
Console.WriteLine(Fact(x));
}
}
}5. By William
Made by William. Factorial calculator in C#. Will not go over 33! for 32 bit limitations. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args) {
int input;
input = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(Factorial(input));
}
static int Factorial(int n) {
int Fact = 1;
for(int i = 1; i <= n; i++) {
Fact *= i;
}
return Fact;
}
}
}
6. By Kamlesh Kumar
Made by Kamlesh Kumar. ( Source )
using System;
public class Factorial
{
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);
}
} 7. By Poker 64
Made by Poker 64. Simple C# program to get the factorial of a number. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter a number to calculate his factorial");
int x_input = Convert.ToInt32(Console.ReadLine());
int x = x_input;
int x_fact = 1;
if (x_input == 0)
{
Console.WriteLine("0! = 1");
}
else if (x_input < 0)
{
x_input *= -1;
x = x_input;
for ( ; x != 0; x--)
{
x_fact *= x;
}
Console.WriteLine("-{0}! = -{1}", x_input, x_fact);
}
else
{
for ( ; x != 0; x--)
{
x_fact *= x;
}
Console.WriteLine("{0}! = {1}", x_input, x_fact);
}
}
}
}8. By Danil
Made by Danil. This little program can calculate factorials. Input any integer number from 0 to 20. Typing in any number lesser then 0 or higher then 20 will cause an error message to be displayed. Same will happen if you input an incorrect data type. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
try{
long x = Convert.ToInt64(Console.ReadLine());
long num = 1;
long res = 1;
if(x<0||x>20){
Console.WriteLine("Invalid input. Please type in an integer number from 0 to 20.");
}else{
while(num<x){
res *= ++num;
}Console.WriteLine("{0}!={1}",x, res);}
}catch (Exception e){
Console.WriteLine("Invalid input. Please type in an integer number from 0 to 20.");
}
}
}
}
9. By Natan
Made by Natan. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static int Fact(int num) {
if (num == 1) {
return 1;
}
return num * Fact(num - 1);
}
static void Main(string[] args)
{
int input = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(Fact(input));
}
}
}10. By Samuel
Made by Samuel. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int factorial;
int number;
int i;
Console.WriteLine("Enter Number");
number = Convert.ToInt32(Console.ReadLine());
factorial =1;
for(i = 1 ; i <= number; i++)
{
factorial = factorial *i;
}
Console.WriteLine("Factorial is:" + factorial);
Console.ReadLine();
}
}
}
11. By Cody Sharp
Made by Cody Sharp. Factorial calculator using recursive method. ( Source )
using System;
namespace SoloLearn{
class Program
{
static void Main(string[] args)
{
int number = Console.ReadLine();
Console.WriteLine("Factorial of {0} is {1}.", number, Factorial(number));
}
static int Factorial(int number)
{
if(x == 0) return 1;
return number * Factorial(number - 1)
}
}
}
12. By Kirby442
Made by Kirby442. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
Fact(num);
Console.WriteLine("{0}! = {1}",num,Fact(num));
}
static int Fact(int num) {
if(num == 1) {
return 1;
}
return num * Fact(num - 1);
}
}
}13. By GenyoNguyen
Made by GenyoNguyen. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static int Fact(int x)
{
if(x == 1)
{
return 1;
}
return x*Fact(x - 1);
}
static void Main(String[] args)
{
int a = Convert.ToInt32(Console.ReadLine());
int b = Fact(a);
Console.WriteLine(b);
}
}
}
14. By Wojciech Powch
Made by Wojciech Powch. Enter positive integer number to get the factorial of that number. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int number_fact = 1;
int number = int.Parse(System.Console.ReadLine());
for(int i = 2;i<=number;i++ ){
number_fact = number_fact * i;
}
Console.WriteLine("Factorial of number {0} is {1}",number,number_fact);
}
}
}
15. By Marko Stankovic
Made by Marko Stankovic. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Sololearn
{
class Program
{
static int num;
static int factorial;
static int Fact(int a)
{
int result = 1;
//the factorial of 0 is 1
if (a == 0)
{
return result;
}
//if the number is not zero, result is multiplied by 1, then 2, then 3..etc until it reaches the number you input
for (int i = 1; i <= a; i++)
{
result *= i;
}
return result;
}
static void Main(string[] args)
{
//you input a number
num = int.Parse(Console.ReadLine());
//the factorial of it is calculated using the Fact method declared at the beggining
factorial = Fact(num);
//the result is printed
Console.WriteLine("The factorial of " + num + " is " + factorial);
}
}
}
16. By Vacid
Made by Vacid. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int num=0;
int result =1;
Console.WriteLine("enter a number: ");
num=Convert.ToInt16(Console.ReadLine());
Console.Write(num+"!=");
Console.Write(num);
for(int i=num;i>1;i--)
{
Console.Write("×"+(i-1));
result = result*i ;
}
Console.Write("="+result);
}
}
}
17. By Karl Michael
Made by Karl Michael. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter a number: ");
int num = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(Factorial(num));
}
private static int Factorial(int arg)
{
int ret = 1;
for(int i = arg; i > 1; i--)
{
ret *= i;
}
return ret;
}
}
}
18. By NezhnyjVampir
Made by NezhnyjVampir. A 64 bit factorial finder in C#. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static long Factorial (long n) {
if (n == 1 || n == 0) {
return 1;
}
return n * Factorial (n - 1);
}
static void Main(string[] args)
{
long num = Convert.ToInt64(Console.ReadLine());
Console.WriteLine(Factorial (num));
}
}
}19. By NezhnyjVampir
Made by NezhnyjVampir. A 32 bit factorial finder in C#. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static int Factorial (int n) {
if (n == 1 || n == 0) {
return 1;
}
return n * Factorial (n - 1);
}
static void Main(string[] args)
{
int num = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(Factorial (num));
}
}
}20. By VEDANG
Made by VEDANG. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using @XPL;
namespace @XPL
{
class @Text
{
public static void @Set(string x)
{
Console.WriteLine(x);
}
public static string @Get()
{
return Console.ReadLine();
}
public static double @ToDouble(object x)
{
return Convert.ToDouble(x);
}
}
}
namespace @Made_by_Vedang
{
class @Code
{
static void Main(string[] args)
{
double x;
double y;
Text.Set("Enter the Number : ");
var st =Text.Get();
try{
x = Text.ToDouble(st);
y = x;
for (double i = x - 1; i >= 1; i--)
{
y *= i;
}
Text.Set("\nFactorial of Given Number is: " + y);
}
catch (FormatException){
Text.Set("Invalid input");
}
}
}
}
21. By Sololearn
Made by Sololearn. C# Factorial calculator using recursion. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
/* the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. */
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
//sample number
int n = 8;
int r = Factorial(n);
Console.WriteLine(n + "! = " + r);
}
static int Factorial(int n)
{
if (n <= 1)
return 1;
return n * Factorial(n - 1);
}
}
}
22. By Dominik Chmelík
Made by Dominik Chmelík. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
try
{
ulong input = ulong.Parse(Console.ReadLine());
Console.WriteLine("The result of {0}! is {1}.", input, Factorial(input));
}
catch
{
Console.WriteLine("Input value is invalid!!!, Please, make sure that input value is number higher or equal 0!!!");
}
}
static ulong Factorial(ulong i)
{
if(i <= 1)
return 1;
return i * Factorial(i - 1);
}
}
}
23. By Yididiya
Made by Yididiya. Factorial finder using array and for loop. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Sololearn
{
class Program
{
static void Main(string[] args)
{
try{
int x = Convert.ToInt32(Console.ReadLine());
int[] arr = new int[x];
int fl = 1;
for (int i = 0; i < x; i++){
arr[i] = (i+1);
}
foreach (int k in arr){
fl *= k;
}
Console.WriteLine("Factorial of {0} is {1}.", x, fl);
}
catch(Exception e){
Console.WriteLine("Please enter a whole number!");
}
}
}
}
24. By 👑 Prometheus 🇸🇬
Made by 👑 Prometheus 🇸🇬. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int b=5;
int a=1;
for (int i=1;i<=b;i++){
a*=i;
}
Console.Write("The factorial of the value b is: ");
Console.Write(a);
}
}
}
25. By Chirag Bhansali
Made by Chirag Bhansali. C# Program to Generate the Factorial of Given Number. ( Source )
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace factorial
{
class Program
{
static void Main(string[] args)
{
int i, number, fact;
Console.WriteLine("Enter the Number");
number = int.Parse(Console.ReadLine());
fact = number;
for (i = number - 1; i >= 1; i--)
{
fact = fact * i;
}
Console.WriteLine("\nFactorial of Given Number is: "+fact);
Console.ReadLine();
}
}
}