Factorial can be evaluated recursively and its very difficult for large numbers. So here we writing code in recursive way using for loop and while loop.

**Using For Loop**:

**C++ program for factorial of a number**

// C++ program for factorial of a number #include <iostream> using namespace std; // function to find factorial of given number unsigned int factorial(unsigned int n) { int res = 1, i; for (i = 2; i <= n; i++) res *= i; return res; } // Driver code int main() { int num = 5; cout << "Factorial of " << num << " is " << factorial(num) << endl; return 0; } // This code is contributed by Shivi_Aggarwal

**C program for factorial of a number**

#include <stdio.h> // function to find factorial of given number unsigned int factorial(unsigned int n) { int res = 1, i; for (i = 2; i <= n; i++) res *= i; return res; } int main() { int num = 5; printf( "Factorial of %d is %d", num, factorial(num)); return 0; }

**Java program for factorial of a number**

// Java program to find factorial of given number class Test { // Method to find factorial of the given number static int factorial(int n) { int res = 1, i; for (i = 2; i <= n; i++) res *= i; return res; } // Driver method public static void main(String[] args) { int num = 5; System.out.println( "Factorial of " + num + " is " + factorial(5)); } }

**Python 3 program for factorial of a number**

# Python 3 program to find # factorial of given number # Function to find factorial of given number def factorial(n): res = 1 for i in range(2, n+1): res *= i return res # Driver Code num = 5; print("Factorial of", num, "is", factorial(num)) # This code is contributed by Smitha Dinesh Semwal

**C# program for factorial of a number**

// C# program to find // factorial of given number using System; class Test { // Method to find factorial // of given number static int factorial(int n) { int res = 1, i; for (i = 2; i <= n; i++) res *= i; return res; } // Driver method public static void Main() { int num = 5; Console.WriteLine( "Factorial of " + num + " is " + factorial(5)); } } // This code is contributed by vt_m

**PHP program for factorial of a number**

<?php // function to find factorial // of given number function factorial( $n) { $res = 1; $i; for ($i = 2; $i <= $n; $i++) $res *= $i; return $res; } // Driver Code $num = 5; echo "Factorial of ", $num, " is ", factorial($num); // This code is contributed // by anuj_67. ?>

**Output :**

```
Factorial of 5 is 120
```

**Using While Loop:**

**C Program for factorial of a number**

// C program for factorial of a number #include <stdio.h> // function to find factorial of given number unsigned int factorial(unsigned int n) { if(n == 0) return 1; int i = n, fact = 1; while (n / i != n) { fact = fact * i; i--; } return fact; } int main() { int num = 5; printf("Factorial of %d is %d", num, factorial(num)); return 0; }

**C++ Program for factorial of a number**

// C++ program for factorial of a number #include <iostream> using namespace std; // function to find factorial of given // number using while loop unsigned int factorial(unsigned int n) { if(n == 0) return 1; int i = n, fact = 1; while (n / i != n) { fact = fact * i; i--; } return fact; } // Driver code int main() { int num = 5; cout << "Factorial of " << num << " is " << factorial(num) << endl; return 0; } // This code is contributed by Shivi_Aggarwal

**Java Program for factorial of a number**

// Java program to find factorial of given number class Test { // Method to find factorial of the given number static int factorial(int n) { if(n == 0) return 1; int i = n, fact = 1; while (n / i != n) { fact = fact * i; i--; } return fact; } // Driver method public static void main(String[] args) { int num = 5; System.out.println( "Factorial of " + num + " is " + factorial(5)); } }

**Python Program for factorial of a number**

# Python 3 program to find # factorial of given number # Function to find factorial of given number def factorial(n): if(n == 0): return 1 i = n fact = 1 while(n / i != n): fact = fact * i i -= 1 return fact # Driver Code num = 5; print("Factorial of", num, "is", factorial(num)) # This code is contributed by Smitha Dinesh Semwal

**C# Program for factorial of a number**

// C# program to find // factorial of given number using System; class Test { // Method to find factorial // of given number static int factorial(int n) { if(n == 0) return 1; int i = n, fact = 1; while (n / i != n) { fact = fact * i; i--; } return fact; } // Driver method public static void Main() { int num = 5; Console.WriteLine( "Factorial of " + num + " is " + factorial(5)); } }

**Output:**

```
Factorial of 5 is 120
```

So time complexity of above iterative is O(n).

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