Factorial Calculator

This is a simple C program that calculates the factorial of a given non-negative integer.

Features

Calculates the factorial of a number entered by the user.
Handles input validation for non-negative integers.
Allows the user to retry with a new input if desired.

Requirements

C compiler (e.g., GCC, Clang)

Usage

Clone the repository or download the source code.
Compile the program using a C compiler. For example, using GCC:
```
gcc factorial.c -o factorial
```
Run the compiled executable:
```
./factorial
```
Enter a non-negative integer when prompted.
The program will output the factorial of the entered number.
Optionally, you can choose to retry with a new input by entering 1 when prompted.

Example

Enter a number to find factorial: 5 Factorial of 5 is 120

Do you want to retry? (Enter 1 for yes, 0 for no): 1 Enter a number to find factorial: 8 Factorial of 8 is 40320

Do you want to retry? (Enter 1 for yes, 0 for no): 0 Exiting program. Goodbye!