Q:

Python | Find factorial of a given number (2 different ways)

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mahmoud2506
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2022-05-18
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Given a number and we have to find its factorial in Python.

Example:

    Input:
    Num = 4

    Output:
    Factorial of 4 is: 24
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mahmoud2506
2022-05-18
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1) Method 1: Using loop

# Code to find factorial on num

# number
num = 4

# 'fact' - variable to store factorial 
fact =1 

# run loop from 1 to num
# multiply the numbers from 1 to num
# and, assign it to fact variable 

for i in range (1,num+1) :
	fact = fact*i 

# print the factorial
print "Factorial of {0} is: {1} ".format (num, fact)

Output

    Factorial of 4 is: 24

2) Method 2: by creating a function using recursion method

To find the factorial, fact() function is written in the program. This function will take number (num) as an argument and return the factorial of the number.

# function to calculate the factorial 
def fact (n):
	if n == 0:
		return 1 
	return n * fact (n - 1)

# Main code 
num = 4

# Factorial
print "Factorial of {0} is: {1} ".format (num, fact(num))

Output

    Factorial of 4 is: 24

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