The factorial of a number n, written in math as n! , is the product of all the numbers from 1 to n or 1*2*3* … *n. write a c++ program that requests a number from the user and then displays the factorial of that number. the program should only accept positive integers greater than 0.

#include <iostream>

using namespace std;

int main()

{

   int factorial=1;

   int num;    

   cout<<"Enter any Number: ";    

   cin>>num;  

   for(int i=1;i<=num;i++){    

     factorial=factorial * i;    

   }    

   cout<<"The factorial of the number is "<<factorial<<endl;  

  return 0;

}

Explanation:

Create the main function and declare the variable.

then, print the message by using the cout instruction.

store the value enter by user in the variable.

After that, take a for loop from 1 to user value both are included.

and multiply the value with previous value and it happen until the condition in the loop true.

for example:

i=1

fact = 1*1=1

i=2

fact =  1*2=2

i=3

fact= 2*3=6  and so on

finally print the result.