Python program to find factorial of a number
In this tutorial, we will discuss Python program to find factorial of a number.
In this post, we use if statements and for loop to calculating factorial of a number
Factorial is a product of all positive descending integer begins with a specified number (n) and calculates up to one
Example
factorial of 5 is
5!=5*4*3*2*1=120
factorial of 7 is
7!=7*6*5*4*3*2*1=5040
The factorial of a positive number n is given below
factorial of n is
n!=n*(n-1)*....2*1
The user can provide numbers as they wish and get the factorial according to their input
Here, we can follow some procedure to reach the completion of this program
- Take a number of input from the user
- Initialize a factorial variable to 1
- A for loop is used to multiply the number to find factirial (for the continuing process)
- This process continue until the value of the number is greater than zero
- The factorial of the given number is printed
Program 1
#python program to find factorial of a number
#the user can provide input for calculating factorial as they wish
num=int(input("Enter a number to find factorial: "));
factorial=1; #declare and initialize variable for factorial
#check if the number is negative or positive or zero
#using if statement in Pyton
if num<0:
print("factorial does not available for a negative number");
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);
When the above code is executed, it produces the following results
Case 1
Enter a number to find factorial: -2 factorial does not available for a negative number
Factorial is not defined for the negative integer value
Case 2
Enter a number to find factorial: 0 The factorial of 0 is 1
Factorial of zero is one
Case 3
Enter a number to find factorial: 5 The factorial of 5 is 120
In the above program, we can check the given number negative, zero or positive using if elif else statements in python
if the number is negative, the output is displayed as follows “factorial does not available for a negative number”
if the number is zero, the output is displayed as follows “The factorial of 0 is 1”
otherwise, if the number is positive, the range function calculates factorial
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