Solution Source Code

Code Overview

1. Header Files and Namespace:

• <iostream> is included for input and output operations.
• <string> is included to allow message-based prompts for better user interaction.
• using namespace std; allows the use of standard functions without prefixing them with std::.

2. User Input Function (ReadPositiveNumber)

• Prompts the user to enter a positive integer.
• Uses a do-while loop to keep asking until the user enters a non-negative number.
• Reads and returns the valid integer.

3. Factorial Calculation Function (Factorial)

• Takes an integer N as input.
• Uses a for loop to compute the factorial:
  • Multiplies numbers from N down to 1.
• Returns the computed factorial value.

4. Program Execution (main())

• Calls ReadPositiveNumber() to get user input.
• Calls Factorial() to compute the factorial.
• Prints the result.
• Returns 0 to indicate successful execution.

This structured explanation ensures clarity and ease of understanding.