timeTillMidnight

#include <iostream>

int main()
{
    const int secondsInMinute{60};
    const int minutesInHour {60};
    const int secondsInHour {minutesInHour * secondsInMinute};
    const int secondsInDay{secondsInHour * 24};

    int seconds {secondsInDay / 4}; // good test case
    int minutes {0};
    int hours {0};

    int secTillMidnight{0};
    int minTillMidnight{0};
    int hourTillMidnight{0};

    std::cout << "Enter seconds:\n";
    std::cin >> seconds;

    secTillMidnight = secondsInDay - seconds;

    hours = seconds / secondsInHour;
    seconds %= secondsInHour;

    hourTillMidnight = secTillMidnight / secondsInHour;
    secTillMidnight %= secondsInHour;

    minutes = seconds / secondsInMinute;
    seconds %= secondsInMinute;

    minTillMidnight = secTillMidnight / secondsInMinute;
    secTillMidnight %= secondsInMinute;

    std::cout << "Now is " << hours << " hour(s) " << minutes << " minute{s) " << seconds << " second(s)\n";
    std::cout << "Time till midnight is  " << hourTillMidnight << " hour(s) " << minTillMidnight << " minute{s) " << secTillMidnight << " second(s)\n";
}