## (R Example for Citizen Data Scientist & Business Analyst)

# R Program to Find the Factorial of a Number

In this example, you’ll learn to find the factorial of a number without using a recursive function.

The factorial of a number is the product of all the integers from 1 to that number. For example, the factorial of 6 (denoted as 6!) is 1*2*3*4*5*6 = 720.

Factorial is not defined for negative numbers and the factorial of zero is one, `0! = 1`

.

This example finds the factorial of a number normally. However, you can find it using recursion as well.

## Example: Find the factorial of a number

```
# take input from the user
num = as.integer(readline(prompt="Enter a number: "))
factorial = 1
# check is the number is negative, positive or zero
if(num < 0) {
print("Sorry, factorial does not exist for negative numbers")
} else if(num == 0) {
print("The factorial of 0 is 1")
} else {
for(i in 1:num) {
factorial = factorial * i
}
print(paste("The factorial of", num ,"is",factorial))
}
```

**Output**

Enter a number: 8 [1] "The factorial of 8 is 40320"

Here, we take input from the user and check if the number is negative, zero or positive using `if...else`

statement.

If the number is positive, we use `for`

loop to calculate the factorial.

We can also use the built-in function `factorial()`

for this.

```
> factorial(8)
[1] 40320
```

Python Examples for Beginners: Python Code to Find Factorial of Number Using Recursion

## R Examples for Beginners – R Program to Find the Factorial of a Number

#### Free Machine Learning & Data Science Coding Tutorials in Python & R for Beginners. Subscribe @ Western Australian Center for Applied Machine Learning & Data Science.

Western Australian Center for Applied Machine Learning & Data Science – Membership

## Sign up to get end-to-end “Learn By Coding” example.

**Introduction to Applied Machine Learning & Data Science for Beginners, Business Analysts, Students, Researchers and Freelancers with Python & R Codes @ Western Australian Center for Applied Machine Learning & Data Science (WACAMLDS) !!!**

Latest end-to-end Learn by Coding Projects (Jupyter Notebooks) in Python and R:

**Applied Statistics with R for Beginners and Business Professionals**

**Data Science and Machine Learning Projects in Python: Tabular Data Analytics**

**Data Science and Machine Learning Projects in R: Tabular Data Analytics**

**Python Machine Learning & Data Science Recipes: Learn by Coding**

Disclaimer: The information and code presented within this recipe/tutorial is only for educational and coaching purposes for beginners and developers. Anyone can practice and apply the recipe/tutorial presented here, but the reader is taking full responsibility for his/her actions. The author (content curator) of this recipe (code / program) has made every effort to ensure the accuracy of the information was correct at time of publication. The author (content curator) does not assume and hereby disclaims any liability to any party for any loss, damage, or disruption caused by errors or omissions, whether such errors or omissions result from accident, negligence, or any other cause.The information presented here could also be found in public knowledge domains.