Hello In this WSQ the principal subject is how to use  factorial.. 

In this program we are gonna use do, if, there are another easier way to do it, but I chose this one! 

not all the factorial are gonna work because the number is to big and im using long long chart, so there is a range !! 🙂

This is my code!! i put some comments for explain what I have been doing! while I was programming

#include <iostream>

#include “BigIntegerLibrary.hh”

using namespace std;

int main(){

  long long int A, B;

  char answer, yes = ‘1’, no = ‘2’;

// in this case we are doing the basic program to determinate is the value is positive or negative. 

do {

  cout << “Give me a number, please.” << endl;

  cin >> A;

  while (A < 0) {

    cout << “You wrote a negative number, try again!!.” << endl;

    cin >> A;

  }

// we make B equal to A , for evaluate the value. 

  B = A; 

  while (B > 1){

    B = B – 1;  

    A = A * B;  

  }  

  if (A==0){

    A=1;

  }

// now its time to print the answer of the factorial we chose. 

  cout << “The factorial of you number is…” << endl << A << endl;

// I decided to put this conditional to try another values for the factorial.

  cout << “Do you want to try with another number? ( yes press 1/ no press 2 )” << endl;

  cin >> answer;

// the program will repet when the user write 1. 

} while (answer == yes);

//but if the user chose “2 “, the program will close.

  if ( answer == no ) {

    cout << “Thank you.The program it’s over!” << endl;

  }

  return 0;

}

#TC1017 # WSQ09