# Factorial Program in C using Function2 min read

In this example, we will calculate the factorial of a number taking the value from the user in C.

Before we begin, you should have the knowledge of the following in C Programming:

Factorial of n number: Factorial of n number is the product of all the positive descending integers and is denoted by n!.
Example:

factorial of n (n!) = n * (n-1) * (n-2) * (n-3)….1
factorial of 5 (n!) = 5 * 4 * 3 * 2 * 1
NOTE: Factorial of 0 (0!) = 1

In this tutorial, we will see various ways to find the factorial of a number in C.

## 1. Factorial Program in C using Function with return.

Output:

`Enter the number to find factorial: 5 Factorial of 5 is: 120`

## 2. C program to find factorial of a number using Ternary operator with recusrion

The following program uses the recursion technique along with the Ternary operator. Also, the program does not declare the function prototype at first like the previous because the function is defined before the main() function.

Output:

`Enter the number to find factorial: 5 Factorial of 5 is: 120`

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