Fibonaci

#include <cstdlib>
#include <stdio.h>
#include <iostream>

using namespace std;

int main(int argc, char** argv) {
    int a=1, b=0, c, step;
    while(c<20) {
        if(step == 0) {
            cout << a << " ";
            step++;
        } else {
        c = a+b;
        b = a;
        a = c;
        cout << c << " ";
        }
    }
    cout << endl;
    return 0;
}