What is Factorial Program?

Factorial Program in C: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example: 5! = 5*4*3*2*1 = 120.

How do you code a factorial for a loop in Python?

1. num = int(input("enter a number: "))
2. fac = 1.
3. for i in range(1, num + 1):
4. fac = fac * i.
5. print("factorial of ", num, " is ", fac)

Factorial Program in Python

# Python program to find the factorial of a number provided by the user.

# change the value for a different result
num = 7

# To take input from the user
#num = int(input("Enter a number: "))

factorial = 1

# check if the number is negative, positive or zero
if num < 0:
   print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
   print("The factorial of 0 is 1")
else:
   for i in range(1,num + 1):
       factorial = factorial*i
   print("The factorial of",num,"is",factorial)