Program to Find the Factorial of a Number using Recursion in Python. This program source code has if else statement and factorial mathematical concept. This program is widely asked in Python practical lab of beginners, class 11,12 and B Tech computer science students. Download source code.

## Program to Find the Factorial of a Number using Recursion in Python

### What is factorial?

Factorial is a non-negative integer. It is the product of all positive integers less than or equal to that number you ask for factorial. It is denoted by an exclamation sign (!).**Example:**

n! = n* (n-1) * (n-2) *……..1

4! = 4x3x2x1 = 24

The factorial value of 4 is 24.

### What is recursion ?

Recursion is a method in which a function calls itself.

### Source code : Program to Find the Factorial of a Number using Recursion in Python

```
num = int(input("Enter a number: "))
def fact(n):
return 1 if (n==1 or n==0) else n * fact(n - 1);
print("Factorial of",num,"is",fact(num))
```

### Download Source code : For Download Click on the below Button

### Step wise Source Code Explanation:

**We have used the recursion to find the factorial of a given number. **

1.**The number whose factorial is to be calculated is captured.**

num = int(input(“Enter a number: “))

2.**We have defined the fact(num) function, which returns one if the entered value is 1 or 0 otherwise until we get the factorial of a given number.**

num = int(input(“Enter a number: “))

def fact(n):

return 1 if (n==1 or n==0) else n * fact(n – 1);

3.

**Print the fact(num)**

print(“Factorial of”,num,”is”,fact(num))

### Output :

Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 19:29:22) [MSC v.1916 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license()" for more information. >>> RESTART: C:/Users/ARCHIT/AppData/Local/Programs/Python/Python37-32/test1.py Enter a number: 6 Factorial of 6 is 720 >>> RESTART: C:/Users/ARCHIT/AppData/Local/Programs/Python/Python37-32/test1.py Enter a number: 7 Factorial of 7 is 5040 >>>

### Output Explanation :

Number is captured

Enter a number: 6

The factorial is calculated and displayed

The factorial of 6 is 720

Similarly, 7 factorial is displaying.

### Conclusion :

The program is running fine.

Thank you for learning the following Program to Find the Factorial of a Number in Python. This program source code has if else statement and factorial mathematical concept. This program is widely asked in Python practical lab of beginners, class 11,12 and B Tech computer science students. For more programming knowledge click on the below links where practical programs of class 11,12 and beginner is provided.

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