Question

Write a program to calculate factorial of a number using python.

Answer 1

# 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)

Answer 2

$\huge \purple{ \underline{ \boxed{ \red{ \mathbb{ANSWER : }}}}}$

$\red{ \textsf{n=int(input("Enter number to find factorial : "))}}$

$\red{ \textsf{fact=1}}$

$\red{ \textsf{for i in range(1,n+1):}}$

$\red{ \textsf{ \: \: \: \: fact=fact*i}}$

$\red{ \textsf{print("Factorial of ",n,"is",fact)}}$

$\large \green{ \underline{ \underline{ \mathbb{KNOW \: MORE :}}}}$

$\large\orange{ \textsf{for}}$

for is the keyword in python which is used to form a loop whose definite length is known , it does not takes the last value . For example , the above loop will run till the number 'n' entered by the user and not till 'n+1' .

$\large\orange{ \textsf{print}}$

print is the keyword in python programming language . It print anything which is written within it .

$\large\orange{ \textsf{input}}$

input takes the input from the user in the form of string .

$\large\orange{ \textsf{int}}$

int converts the input into integer form .