# Complete printfactorial() Recursive Case: How to Write Code & Get Sample Output with Userval 5

## Introduction

The `printfactorial()` function is used to calculate the factorial of a given number using recursion. This function is useful when you need to calculate the factorial of a large number. In this guide, we will provide you with a step-by-step solution on how to write code for the `printfactorial()` function and get a sample output with a user value of 5.

## Prerequisites

Before you start writing code for the `printfactorial()` function, you need to have a basic understanding of the following programming concepts:

• Recursion
• Functions
• Control flow statements

## How to Write Code for the printfactorial() Function

To write code for the `printfactorial()` function, follow these steps:

1. Create a new C file and name it `printfactorial.c`.
2. Open the file in your preferred text editor.
3. Declare the `printfactorial()` function as follows:
``````int printfactorial(int n);
``````
1. Define the `printfactorial()` function as follows:
``````int printfactorial(int n) {
if (n == 1) {
return 1;
} else {
return n * printfactorial(n-1);
}
}
``````
1. Save the file.

## How to Get Sample Output with Userval 5

To get a sample output with a user value of 5, follow these steps:

1. Open a terminal window and navigate to the directory where the `printfactorial.c` file is saved.
2. Compile the `printfactorial.c` file using the following command:
``````gcc printfactorial.c -o printfactorial
``````
1. Run the `printfactorial` executable file using the following command:
``````./printfactorial
``````
1. Enter the value `5` when prompted.
``````Enter a number: 5
``````
1. The output should be as follows:
``````Factorial of 5 is: 120
``````

## FAQ

### Q1. What is the `printfactorial()` function?

The `printfactorial()` function is used to calculate the factorial of a given number using recursion.

### Q2. What are the prerequisites for writing code for the `printfactorial()` function?

Before you start writing code for the `printfactorial()` function, you need to have a basic understanding of recursion, functions, and control flow statements.

### Q3. How do I compile the `printfactorial.c` file?

You can compile the `printfactorial.c` file using the following command:

``````gcc printfactorial.c -o printfactorial
``````

### Q4. How do I run the `printfactorial` executable file?

You can run the `printfactorial` executable file using the following command:

``````./printfactorial
``````

### Q5. What is the output of the `printfactorial()` function with a user value of 0?

The output of the `printfactorial()` function with a user value of 0 is 1.

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