Explain what a factorial is and why it's important in mathematics and computer science

Describe the purpose of the C program.

Explain the importance of user input in this program.

Include necessary header files.

Define function prototypes for better organization.

Declare variables for input and factorial calculation.

Prompt the user to enter a positive integer.

Use scanf() to read the input and store it in a variable.

Implement a separate function to calculate the factorial of the entered number.

Handle special cases like 0 and 1 as the factorial of both is 1.

Use a loop to calculate the factorial of the number Display the calculated factorial to the user.

Use printf() to print the result.

Handle non-positive integer inputs gracefully.

Display an error message and ask the user to enter a valid positive integer.

Summarize the importance of the factorial calculation in programming.