Factorial Calculator in Pascal

This program, written in Pascal, calculates the factorial of a given number using a recursive approach.

Overview

The FactorialCalculator prompts the user for an integer input. It then calculates the factorial of the number provided by the user using a recursive function. If a negative number is input, the user will be notified that they should provide a non-negative integer.

How to Run

Prerequisites

• A Pascal compiler, such as Free Pascal.
• Knowledge on how to compile and run Pascal programs.

Compilation and Execution

1. Save the provided code into a file named FactorialCalculator.pas.
2. Compile the program using a Pascal compiler. For example, using Free Pascal:

fpc FactorialCalculator.pas

3. After compilation, run the executable:

./FactorialCalculator

Usage

Upon execution, the program will prompt:

Enter a number to calculate its factorial:

Input a non-negative integer and press enter. The program will then display the factorial of the given number. If a negative number is input, you'll be prompted to enter a non-negative integer.