Fibonacci in C++

Published on 28 April 2022 (Updated: 25 September 2022)

Fibonacci in C++

Welcome to the Fibonacci in C++ page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

#include <iostream>
#include <cstdlib>
using namespace std;

int main(int argc, char *argv[])
{
  if (argc < 2 || std::string(argv[1]) == "")
  {
    cout << "Usage: please input the count of fibonacci numbers to output" << endl;
    return 1;
  }

  int n = atoi(argv[1]);
  if (n == 0 && std::string(argv[1]) != "0")
  {
    cout << "Usage: please input the count of fibonacci numbers to output" << endl;
    return 1;
  }
  int first = 0;
  int second = 1;
  int result = 0;

  for (int i = 1; i <= n; ++i)
  {
      result = first + second;
      first = second;
      second = result;
      cout << i << ": " << first << endl;
  }
  return 0;
}

Fibonacci in C++ was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Apr 12 2019 09:55:23. The solution was first committed on Oct 06 2018 16:51:18. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.