C++面向对象程序设计 第3章1例程讲解.docVIP

3-1 include iostream using namespace std; class Time {public: Time( ) {hour=0; minute=0；sec=0; } void set_time(); void show_time(); private: int hour; int minute; int sec; }; void Time::set_time( ) {cinhour; cinminute; cinsec; } void Time::show_time( ) { couthour:minute:secendl; } int main( ) { Time t1; t1.show_time(); Time t2; t2.show_time(); return 0; } 3-1-1 #include iostream using namespace std; class Time {public: Time( ) {hour=0; minute=0; sec=0; } void set_time(); void show_time(); private: int hour; int minute; int sec; }; int main() { Time t1; t1.set_time(); t1.show_time(); Time t2; t2.show_time(); return 0; } void Time::set_time() {cinhour; cinminute; cinsec; } void Time::show_time() { couthour:minute:secendl; } 3-1-2 #include iostream using namespace std; class Time {public: Time(); void show_time(); private: int hour; int minute; int sec; }; Time::Time() { hour=0; minute=0; sec=0; } int main() { Time t1; t1.show_time(); Time t2; t2.show_time(); return 0; } void Time::show_time() { couthour:minute:secendl; } 3-2 #include iostream using namespace std; class Box {public: Box(int,int,int); int volume(); private: int height; int width; int length; }; Box::Box(int h,int w,int len) {height=h; width=w; length=len; } int Box::volume() {return(height*width*length); } int main() { Box box1(12,25,30); coutThe volume of box1 is box1.volume()endl; Box box2(15,30,21); coutThe volume of box2 is box2.volume()endl; return 0; } 3-3在例3.2的基础上，定义两个构造函数，其中一个无参数，一个有参数。 #include iostream using namespace std; class Box {public: Box(); Box(int h,int w ,int len):height(h),width(w),length(len){} int volume(); private: int height; int width; int length; }; Box::Box() {height=10; width=10; length=10; } int Box::volume() {return(height*width*length); } int main(