*Calculate factorial using recursion*

Write a C program to calculate factorial using recursion. Here’s a Simple Program to find factorial of a number using recursive methods in C Programming Language.

This Program prompts user for entering any integer number, finds the factorial of input number and displays the output on screen.

**Factorial of a Number : :**

**Factorial of a Number : :**

A factorial of a number x is defined as the product of x and all positive integers below x. A factorial is product of all the number from 1 to the user specified number.

The factorial of a positive number n is given by ::

factorial of n (n!) = 1*2*3*4….n

The factorial of a negative number doesn’t exist. And the factorial of 0 is 1. You will learn to find the factorial of a number using recursion method in this example.

** Using Recursion : :**

**Using Recursion : :**

We will use a recursive user defined function to perform the task. Here we have a function that calls itself in a recursive manner to find out the factorial of input number.

`fact( )`

Below is the source code for C program to calculate factorial using recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

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/* C program to calculate factorial using recursion */ #include<stdio.h> long int fact(int n); int main( ) { int num; printf("Enter any number :: "); scanf("%d", &num); printf("\nUsing Recursion ---> \n"); if(num<0) printf("\nError! No factorial for negative number...\n"); else printf("\nFactorial of [ %d! ] is :: %ld\n", num, fact(num) ); return 0; }/*End of main()*/ /*Recursive*/ long int fact(int n) { if(n == 0) return(1); return(n * fact(n-1)); }/*End of fact()*/ |

**OUTPUT : :**

**OUTPUT : :**

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/* C program to calculate factorial using recursion */ Enter any number :: 7 Using Recursion ---> Factorial of [ 7! ] is :: 5040 Process returned 0 |

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