Question

用c++编写时间类time，增加3个构造函数：缺省构造函数,带3个参数的构造函数以及拷贝构造函数。

要求;1,利用不同的构造函数创建新对象;
2,利用new和delete运算符创建和撤销对象；
3，创建一个对象数组，分别利用数组下标和对象指针实现对数组元素的遍历。

Answer 1

#include <iostream>
using namespace std;

class Time
{
public:
Time(int=0, int=0, int=0);
//Time(int, int, int);
Time(Time &t);
void display();
private:
int h;
int m;
int s;
};

Time::Time(int a, int b, int c)
{
h = a;
m = b;
s = c;
}

Time::Time(Time &t)
{
h = t.h;
m = t.m;
s = t.s;
}

void Time::display()
{
cout<<h<<":"<<m<<":"<<s<<endl;
}

int main(int argc, char* argv[])
{
Time t0;
t0.display();

Time t1(3,12,48);
t1.display();

Time t2(t1);
t2.display();

Time *t3 = new Time(6,10,39);
t3->display();

Time pt[3] = {t0, t2, *t3};

for(int i=0; i<3; i++)
{
pt[i].display();
}

delete t3;

return 0;
}