Question

In mathematics, the notation n! represents the factorial of the nonnegative integer n. The factorial of n is the product of all the nonnegative integers from 1 to n. For example: 7! = 1 x 2 x 3 x 4 x 5 x 6 x 7 = 5,040 Write a program that lets the user enter a nonnegative integer and then uses a loop to calculate the factorial of that number. Print the factorial to standard output.

Answer 1

Following are the python program to calculate the factorial value:

Program:

factorial=1 #declare a variable.  

number=int(input("Enter a positive integer:")) #input a number.  

while (number>0): #loop  

   factorial= factorial*number # holding value in factorial variable  

   number=number-1  

print('=',factorial) #print value.

Program Explanation:

The description of the above python program can be given as:

• In the above program firstly we define a variable that is "factorial".
• In this variable, we assign a value that is 1 and it is used to calculate the factorial value.  
• We define a variable "number". The number variable is used to take input from the user.  
• Then we define a loop in the loop we calculate the factorial and hold the value in the factorial value in the last we print the value.  

Output:

Enter a positive integer: 6  

= 720  

Find out more information about the factorial here:

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