Write a python program using functions …

Find factorial using Python function – using for loop

#Pyton program to find factorial of a number

def factorial(num):#function definition

fact=1

for i in range(1, num+1):#for loop for finding factorial

fact=fact*i

return fact #return factorial

number=int(input("Please enter any number to find factorial: "))

result=factorial(number)#function call and assign the value to variable result

print("The factorial of %d = %d"%(number,result))

When the above code is executed, it produces the following results

Please enter any number to find factorial: 6

The factorial of 6 = 720

Find factorial using Python function – using while loop

def factorial(num):#function definition

fact=1;

i=1

while i<=num:

fact=fact*i

i=i+1

return fact

num=input("Enter a number..");

result=factorial(num)

print("factorial of the number: %d" %result)

factorial(num)#function call

When the above code is executed, it produces the following results

Enter a number..5

factorial of the number: 120

Programming approaches for implementing these program

• Take a number as input  from the user and stored in variable number for finding factorial
• Declare a python function to find factorial
• Inside the function, declare the variable fact and initialise as 1
•  Inside the function, find the factorial of a given number using for loop in Python
• Run the loop from given number until 1 and multiply numbers
• Call the factorial() function and assign the output to variable result
• the factorial of the given number is displayed using the print() function in Python