The 3n + 1 problem with some error

problem3nplus1.cpp

#include <iostream>

int cycle_lenght (int i)
{
    int lenght = 1;
    int n = i;
    while (n != 1)
    {
        n = n % 2 == 0? n / 2 : 3 * n + 1;
        lenght++;
    }
    return lenght;
}

int main(int argc, char const *argv[])
{
    while(!std::cin.eof())
    {
        int i, j, min, max, lenght, maxlength = 1;

        std::cin >> i >> j;
        min = i < j? i : j;
        max = i < j? j : i;
        
        while (min <= max)
        {
            lenght = cycle_lenght(min++);
            if (lenght > maxlength)
                maxlength = lenght;
        }

        std::cout << i << " " << j << " " << maxlength << std::endl;
    }
    return 0;
}