Fibonacci

// msvc++
// paulogp
#include <iostream> // cout...
#include <Windows.h> // Sleep

using namespace std;

unsigned fibonacci (unsigned the_n);

unsigned fibonacci (unsigned the_n)
{
    unsigned the_sum = 0;

    if (the_n > 0)
    {
    for (unsigned i = 0, f0 = 0, f1 = 1; i < (the_n - 1); ++i)
    {
        the_sum = f0 + f1;
        f0 = f1;
        f1 = the_sum;
    }}

    if (the_n > 1)
        return the_sum;
    else
        return the_n;
}

int main()
{
    unsigned the_n;

    cout << "number: ";
    cin >> the_n;

    cout << "f(" << the_n << "): " << fibonacci (the_n) << endl;

    Sleep (5000);

    return 0;
}