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#include <iostream>
#include <string>
using namespace std;
class Fibo
{
size_t d_return = 0;
size_t d_next = 1;
public:
size_t next();
};
size_t Fibo::next()
{
size_t ret = d_return; // the next fibonacci number
d_return = d_next; // at the next call: return d_next;
d_next += ret; // prepare d_next as the sum of the
// original d_return and d_next
return ret;
}
int main(int argc, char **argv)
{
Fibo fibo; // create a Fibo object
size_t sum = 0;
// use its 'next' member to obtain
for ( // the sequence of fibonacci numbers
size_t begin = 0, end = argc == 1 ? 10 : stoul(argv[1]);
begin != end;
++begin
)
sum += fibo.next();
cout << sum << '\n';
}
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