Python program find factorial of a number using recursion

Python program find factorial of a number using recursion

In this tutorial, we will discuss Python program find factorial of a number using recursion.

Factorial is a product of all positive descending integer begins with a specified number (n) and calculates up to one

• Factorial is not defined for negative numbers
• Factorial of zero(0) is: 1
• Factorial of positive number is  given below

Example

factorial of 5 is

5!=5*4*3*2*1=120

factorial of 7 is

7!=7*6*5*4*3*2*1=5040

The factorial of a positive number n is given below

factorial of n is

n!=n*(n-1)*....2*1

In my previous post, I have explained the various ways to Find factorial of a number in Python

However, in this program, we embed the logic of the factorial program in the recursive function

The user can provide numbers as they wish and get the factorial according to their input

Program 1

def recursion_fact(num)://function definition
    if num==1:
       return num
    else:
       return num*recursion_fact(num-1)

#take input from the user

number=int(input("Enter the number for find factorial"))

#test the number is negative

if number<0:
        print("The factorial does not available for negative number")

#test the number is zero
elif number==0:
        print("The factorial of zero is 1")

#if the number is positive,  displays the factorial
else:
      print("factorial of" , number,"is: ",recursion_fact(number))

When the above code executed, it produces the following results

case 1

Enter the number for find factorial5
factorial of 5 is: 120

case 2

Enter the number for find factorial: 0
The factorial of zero is 1

case 3

Enter the number for find factorial: -6
The factorial does not available for negative number

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