C++ 之 指针详解篇(三)

class A    //申明类A
{
  public:
    A();
    ~A();
    void setlength(int length){ilength = length;}
    int getlength()const{return ilength;}   
    void setWidth(int width){iwidth = width;}   
    int getwidth()const{return iwidth;} 
  private:
    int ilength;
    int iwidth;
};
A::A()
{
   iwidth = 5;
   ilength = 10;
}
A::~A()
{
}

int _tmain(int argc, _TCHAR* argv[])
{
    A* ps = new A;  //声明了类A的指针并且动态的分配内存
    const A* pconstA = new A;  //声明了一个指向常量A的指针pconstA
    A* const pconstB = new A;  //声明了一个指向A的常指针pconstB
    cout<<"pS width: "<<ps->getwidth()<<endl;      
    cout<<"pconstA: width:"<<pconstA->getwidth()<<endl;
    cout<<"pconstB: width:"<<pconstB->getwidth()<<endl;  //分别输出以上的值
    ps->setWidth(10);   //设置ps的宽度
    pconstB->setWidth(10);  //设置pconstB的宽度为10
    cout<<"ps width:"<<ps->getwidth()<<endl;
    cout<<"pconstA Width:"<<pconstA->getwidth()<<endl;
    cout<<"pconstB width:"<<pconstB->getwidth()<<endl;
    return 0;
}