C++面向对象作业1

             1 #include <iostream>
 2 #include <stdlib.h>
 3usingnamespace std;
 4class Tdate
 5{
 6public:
 7     Tdate(int mm=0,int dd=0,int yy=0);
 8     ~Tdate()
 9    {
10         cout<<"Call Destructor.\n";
11    }
12void Tdate::SetDate(int m,int d,int y);//构造函数参数设置了缺省值13void print()
14    {
15         cout<<"month="<<month<<",day="<<day<<",year="<<year<<"\n";
16    }
17protected:
18int month,day,year;
19};
20 Tdate::Tdate(int mm,int dd,int yy)
21{
22     month=mm;
23     day=dd;
24     year=yy;
25     cout<<"Call Constructor.\n";
26}
27void Tdate::SetDate(int m,int d,int y)
28{
29if(m>0&&m<13)
30         month=m;
31if(d>0&&d<32)
32         day=d;
33if(y>0&&y<3000)
34         year=y;
35}
36int main()
37{
38     Tdate *pd1,*pd2;
39     pd1=new Tdate(1,1,2000);//创建动态对象，会调用构造函数40     pd1->print();//只能用指针去访问该对象的成员41     pd2=new Tdate(12,31,2007);//创建动态对象，会调用构造函数42if(!pd2)//如果分配堆内存不成功43    {
44         cout<<"Heap error!\n";//输出错误信息45         exit(1);//终止程序运行46    }
47else//如果分配堆内存成功48         pd2->SetDate(8,8,2008);//调用函数重设日期49     pd2->print();
50delete pd1;//删除动态对象，会调用析构函数51delete pd2;//删除动态对象，会调用析构函数52 }