C++ Fibonacci Recursive Functions

fibonacci.cpp

#include<iostream>
using namespace std;

// @params a is first number.
// @params b is second number.
// @params c is the upper limit of numbers.
int fobi(int a, int b, int c) {
    int next = a + b;
    if (next > c) return 0;
    cout << next << " ";
    return fobi(next, a, c);
}

// @params c is number of outputs.
int fibo2(int c) {
    if (c == 1 || c == 0) return c;
    return (fibo2(c - 1) + fibo2(c - 2));
}

main() {
    fobi(0, 1, 100);
    for (int i = 1; i < 12; i++) cout << " " << fibo2(i);
}