Computing the Factorial of a Number Using Three Separate Functions (Coursework Sample)

Assignment 4 on Chapter 4
27th October 202
/*
This program will compute the factorial of a number using three separate functions.
Function 1 is to get the data from the user so we call it getInput().
Function 2 is to compute the factorial of the number we call it
factorial ().
*/
#include
using namespace std;
// All 3 Functions Prototype and Declaration goes here (lines 15,18,and 21 )
int getInput(int &number);
// The function getInput will read the number from the user.
// Will return the number if it was valid input (int)
double factorial(int &number);
int main()
{
double fact;
int number;do
{
getInput(number);
cout << factorial(number) << endl;
} while ( number != -1 );
return 0;
}
// getInput() function definition
int getInput(int &number)
{
cout << "Please enter a number, or enter '-1' to exit: ";
cin >> number;
if (! (cin.good()))
{
cout << "Please enter a number, or enter '-1' to exit: ";
cin.clear();
cin.ignore(INT8_MAX, '\n');
cin.sync();
cin >> number;
}
return (number);
}
// Definition for factorial function
double factorial(int &number)
{
double fact = 1;
// number! = (number -1 ) * number
//cout << "Inside the fac