In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. math.factorial() function returns the factorial of desired number.
Syntax: math.factorial(x) Parameter: x: This is a numeric expression. Returns: factorial of desired number. Time Complexity: O(n) where n is the input number. Auxiliary space: O(1)
Code #1:
Python3
# Python code to demonstrate the working of factorial() # importing "math" for mathematical operations import math
x = 5
# returning the factorial print ( "The factorial of 5 is : " , end = "")
print (math.factorial(x))
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Output:
The factorial of 5 is : 120
Code #2:
Python3
# Python code to demonstrate the working of factorial() # importing "math" for mathematical operations import math
x = 5
y = 15
z = 8
# returning the factorial print ( "The factorial of 5 is : " , math.factorial(x))
print ( "The factorial of 15 is : " , math.factorial(y))
print ( "The factorial of 8 is : " , math.factorial(z))
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Output:
The factorial of 5 is : 120 The factorial of 15 is : 1307674368000 The factorial of 8 is : 40320
Code #3: Throws ValueError if x is not integer
Python3
# Python code to demonstrate the working of factorial() # importing "math" for mathematical operations import math
# when x is not integer print ( "math.factorial(13.7) : " , math.factorial( 13.7 ))
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Output:
ValueError: factorial() only accepts integral values
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