Apr 8, 2025 · The factorial of a number is the product of all positive integers less than or equal to that number. For example, the factorial of 5 (denoted as 5!) is 5 × 4 × 3 × 2 × 1 = 120. In Python, we can calculate the factorial of a number using various methods, such as loops, recursion, built-in functions,

Feb 14, 2023 · Given a positive number N, the task is to calculate the factorial of N without using the multiplication operator. Examples: Input: N = 5 Output: 120 Explanation: 5*4*3*2*1=120. Input: N = 7 Output: 5040. Observation: A*B=A+A+A+A...B times. This observation can be used as follows: 5!=5*4*3*2*1 =(5+5+5+5)*3*2*1 =(20+20+20)*2*1 =60+60 =120

Jan 6, 2022 · The easiest way is to use math.factorial (available in Python 2.6 and above): If you want/have to write it yourself, you can use an iterative approach: fact = 1. for num in range(2, n + 1): fact *= num. return fact. or a recursive approach: if n < 2: return 1. else: return n * factorial(n-1)

Here is source code of the Python Program to find the factorial of a number without using recursion. The program output is also shown below. fact = fact*n. n = n- 1 print("Factorial of the number is: ") print(fact) 1. User must enter a number. 2. A factorial variable is initialized to 1. 3.

Here, the number whose factorial is to be found is stored in num, and we check if the number is negative, zero or positive using if...elif...else statement. If the number is positive, we use for loop and range() function to calculate the factorial.

Mar 7, 2024 · def factorial(num): result = 1 while num > 1: result *= num num -= 1 return result print(factorial(5)) Output: 120. This function, factorial(num), also computes the factorial of the given number.

Find the factorial of an input number. check the number before using factorial() method. Check your answer without importing math module. import math x = input ( "Enter the number : " ) if x . isdigit (): print (math.factorial( int ( x ))) else : print ( " Enter correct number " )

Mar 12, 2021 · Learn how to find the factorial of a number without using recursion in Python. Step-by-step guide with code examples.

Jul 9, 2024 · Not many people know, but python offers a direct function that can compute the factorial of a number without writing the whole code for computing factorial. Naive method to compute factorial. Using math.factorial () This method is defined in “math” module of python. Because it has C type internal implementation, it is fast.

Mar 31, 2025 · The reduce() function in Python (from functools module) applies a given function cumulatively to elements of an iterable, reducing it to a single value. Syntax: from functools import reduce reduce ... the article highlights the use of the math.factorial() function from Python’s standard library, providing a readily available and optimized ...