OOP-TP2-1.cpp

#include <iostream>

class Waktu {
    private:
        int jam;
        int menit;
    
    public:
        Waktu(int j, int m) {
            jam = j;
            menit = m;
        }
        
        // overloading operator ++
        void operator++() {
            menit++;
            if (menit >= 60) {
                jam++;
                menit = 0;
            }
            if (jam >= 24) {
                jam = 0;
            }
        }
        
        // overloading operator --
        void operator--() {
            menit--;
            if (menit < 0) {
                jam--;
                menit = 59;
            }
            if (jam < 0) {
                jam = 23;
            }
        }
        
        void display() {
            std::cout << "H: " << jam << " M: " << menit << std::endl;
        }
};

int main() {
    Waktu w1(12, 0);
    Waktu w2(10, 41);

    --w1;
    w1.display();
  
    // increment waktu 1 menit
    ++w1;
    w1.display();
    
    // decrement waktu 1 menit
    ++w1;
    w1.display();

    --w2;
    w2.display();
  
    // increment waktu 1 menit
    ++w2;
    w2.display();
    
    // decrement waktu 1 menit
    ++w2;
    w2.display();
  
    return 0;
}