INF205/lab_1/3.cpp

#include <iostream>
#include <string>

int print_fibo_until(int x)
{
    int n = 1;
    int fibo_n = 1;
    int fibo_previus = 0;

    while(x >= fibo_n) 
    {
        std::cout << std::to_string(n) + std::to_string(fibo_n) + "\n";
        int fibo_next = fibo_n + fibo_previus;
        n++;
        fibo_previus = fibo_n;
        fibo_n = fibo_next;
    }
    return (x==fibo_previus);
}

int main()
{
    int y = 17711;
    if(print_fibo_until(y))
    {
        std::cout << y;
        std::cout << " is a Fibonacci number\n";
    }
    else
    {
        std::cout << y;
        std::cout << " is not a Fibonacci number\n";
    }
}