1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/*
This file is part of Hotspot, the Qt GUI for performance analysis.
Copyright (C) 2017-2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
Author: Milian Wolff <milian.wolff@kdab.com>
Licensees holding valid commercial KDAB Hotspot licenses may use this file in
accordance with Hotspot Commercial License Agreement provided with the Software.
Contact info@kdab.com if any conditions of this licensing are not clear to you.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <string>
unsigned long long __attribute__((noinline)) fibonacci(unsigned i)
{
if (i == 0 || i == 1)
return 1ull;
return fibonacci(i - 1) + fibonacci(i - 2);
}
int main(int argc, char** argv)
{
if (argc != 2) {
std::cerr << "Usage: cpp-recursion N" << std::endl;
return 1;
}
unsigned i = std::stoi(argv[1]);
std::cout << "fib(" << i << ") = " << fibonacci(i) << std::endl;
return 0;
}
|
