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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