Time24

#include <iostream>
#include <iomanip>

using namespace std;

class Time24{
private:
    int hh, mm, ss;
public:
    Time24(): hh(00), mm(00), ss(00) {}
    Time24(int h, int m, int s): hh(h), mm(m), ss(s) {}
    ~Time24() {}

    int getH() {return hh;}
    int getM() {return mm;}
    int getS() {return ss;}
    void showData();
    Time24 operator ++ ();
    Time24 operator ++ (int);
    Time24 operator -- ();
    Time24 operator -- (int);
    Time24 operator + (Time24 A);
    Time24 operator - (Time24 A);
    bool operator > (Time24 A);
    bool operator < (Time24 A);
    bool operator == (Time24 A);
    bool operator != (Time24 A);
};


int main (){
    Time24 t1(15, 0, 0), t2(14, 59 , 59);

    ++t1;
    t2--;

    Time24 t3 = t1 + t2;
    Time24 t4 = t1 - t2;

    t1.showData();
    t2.showData();
    t3.showData();
    t4.showData();

    if(t3 != t4) cout << "t3 is not equal to t4" << endl;
    if(t3 < t4) cout << "t3 is smaller than t4" << endl;
    else if(t3 > t4) cout << "t3 is larger than t4" << endl;
    else cout << "t3 is equal to t4" << endl;

    return 0;
}

void Time24::showData() {
    cout << setw(2) << hh << ":" << setw(2) << mm << ":" << setw(2) << ss << endl;
    return;
}

Time24 Time24::operator ++ () {
    Time24 temp;
    temp.hh = ++hh;
    temp.mm = mm;
    temp.ss = ss;

    return temp;
}

Time24 Time24::operator ++ (int) {
    Time24 temp;
    temp.hh = ++hh;
    temp.mm = mm;
    temp.ss = ss;

    return temp;
}

Time24 Time24::operator -- () {
    Time24 temp;
    temp.hh = --hh;
    temp.mm = mm;
    temp.ss = ss;

    return temp;
}

Time24 Time24::operator -- (int) {
    Time24 temp;
    temp.hh = --hh;
    temp.mm = mm;
    temp.ss = ss;

    return temp;
}

Time24 Time24::operator + (Time24 A){
    Time24 temp;

    if(A.ss + ss < 60)
        temp.ss = A.ss + ss;
    else {
        mm++;
        temp.ss = A.ss + ss - 60;
    }

    if(A.mm + mm < 60)
        temp.mm = A.mm + mm;
    else {
        hh++;
        temp.mm = A.mm + mm - 60;
    }

    temp.hh = A.hh + hh;

    return temp;
}

Time24 Time24::operator - (Time24 A){
    Time24 temp;

    if(ss - A.ss >= 0)
        temp.ss = ss - A.ss;
    else {
        mm--;
        temp.ss = ss + 60 - A.ss;
    }

    if(mm - A.mm >= 00)
        temp.mm = mm - A.mm;
    else {
        hh--;
        temp.mm = mm + 60 - A.mm;
    }

    temp.hh = hh - A.hh;

    return temp;
}

bool Time24::operator > (Time24 A) {
    if(hh > A.hh) return true;
    else if(hh < A.hh) return false;
    if(mm > A.mm) return true;
    else if(mm < A.mm) return false;
    if(ss > A.ss) return true;
    else if(ss < A.ss) return false;
}

bool Time24::operator < (Time24 A) {
    if(hh < A.hh) return true;
    else if(hh > A.hh) return false;
    if(mm < A.mm) return true;
    else if(mm > A.mm) return false;
    if(ss < A.ss) return true;
    else if(ss > A.ss) return false;
}

bool Time24::operator == (Time24 A) {
    if(hh == A.hh && mm == A.mm && ss == A.ss) return true;
    else return false;
}

bool Time24::operator != (Time24 A) {
    if(hh == A.hh && mm == A.mm && ss == A.ss) return false;
    else return true;
}