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Python program to find factorial of a number|in 5 ways
In this tutorial, we will discuss the Python program to find factorial of a number|in 6 ways
In this post, we are going to learn how to find the factorial of the given number in Python language
What is the factorial of a number (n)?
The factorial of a number (n) is the product of all positive integers from 1 up to n (n is the given number).
It is simply denoted by n!.
Example
if you want to find the factorial for number 5, you can follow this method.
Factorial of 5 will be 5*4*3*2*1=120
So, 5!=120.
Program to find factorial- standard method
Program 1
#Python program to find factorial of a number
num=6
fact=1 #Variable declaration and initilization
if num<0:
print("Factorial does not available to negative");
elif num==0:
print("factorial of 0 is 1")
else:
while(num>0):
fact=fact*num
num=num-1
print("Factorial of the number is: ")
print(fact)
When the above code is executed it produces the following output
Factorial of the number is: 720
In this program
- Integer variable num and fact are declared and initialized
- The program finds the factorial using the while loop
- Then, the program has displayed the factorial of a number using the print() function
Program to find factorial- for loop entered by user
Program 2
num=int(input("Enter a number to find factorial"))
factorial=1
if num<0:
print("Factorial does not available to negative");
elif num==0:
print("factorial of 0 is 1")
else:
for i in range(1,num+1):
factorial=factorial*i
print("Factorial of the",num," is: ",factorial)
When the above code is executed it produces the following output
Enter a number to find factorial5 Factorial of the 5 is: 120
The program allows the user to enter a value and it finds and displays factorial of the given number using for loop in Python language
Program to find factorial- while loop (entered by the user)
Program 3
num=int(input("Enter a number to find factorial: "))
fact=1
if num<0:
print("Factorial does not available to negative");
elif num==0:
print("factorial of 0 is 1")
else:
while(num>0):
fact=fact*num
num=num-1
print("Factorial of the number is: ",fact)
When the above code is executed it produces the following output
Enter a number to find factorial: 4 Factorial of the number is: 24
The program allows the user to enter a value and it finds and displays factorial of the given number using while loop in Python language
Program to find factorial- using function
Program 4
#Python program to find factorial of a number
def factorial(num): #Function definition
fact=1# variable initialization
if num<0:
print("Factorial does not available to negative");
elif num==0:
print("factorial of 0 is 1")
else:
for i in range(1,num+1):
fact=fact*i
return fact
num=int(input("Enter a number to find factorial: "))
result = factorial(num)
#function call and assign the value to result
print("Factorial of the %d = %d "%(num,result))
When the above code is executed it produces the following output
Enter a number to find factorial: 5 Factorial of the 5 = 120
The program allows the user to enter a value and it finds and displays factorial of the given number using the function in Python language
Program to find factorial- using recursion
Program 5
#Python program to find factorial of a number using recursion
def recur_Findfact(n):#function definition
if n==1:
return n
else:
return n*recur_Findfact(n-1)
num=int(input("Enter a number to find factorial"))
if num<0:
print("Factorial does exist for negative number ")
elif num==0:
print("The factorial of 0 is 1 ")
else:
print("The factorial of",num," is ",recur_Findfact(num))
When the above code is executed it produces the following output
Enter a number to find factorial6 The factorial of' 6 is: 720
The program allows the user to enter a value and it finds and displays factorial of the given number using the recursive function in Python
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