//ex4-5.cpp//clock.hclass clock{private:int hour,minute,second;public:void init();void update(); unsigned display;};//clock.cpp#include
#include"clock.h"void clock::init(){hour=minute=second=0;}void clock::update(){second++;if (second==60){second=0;minute++;}if (minute==60){minute=0;hour++;}if (hour==24){hour=0;}void clock::display(){cout<

"clock.h"
#ifndef MY_H #
define MY_H 1 class clock { private: int hour,minute,second; public: void init(); void update(); void display(); };
#else #
endif #include
#include"clock.h" void clock::init() { hour=minute=second=0; } void clock::update() { second++; if (second==60) {second=0; minute++; } if (minute==60) { minute=0; hour++; } if (hour==24) { hour=0; } } void clock::display() { cout<