动态内存分配和回收

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#include <iostream>
using namespace std;
class A
{
public:
    A(){cout<<"A";}
    ~A(){cout<<"~A";}

};
class B
{
    A *p;
public:
    B(){cout<<"B";
    p=new A();
    }
    ~B()
    {
        cout<<"~B";
        delete p;
    }
};




int main()
{

   B obj;
    return 0;
}

#include <iostream>
using namespace std;
class myclass
{
public:
    myclass(int x=0):i(x){cout<<"C"<<i;}
    ~myclass(){cout<<"D"<<i;}
    void setvalue(int val){i=val;}
    int getval(){return i;}
private:
    int i;

};


int main()
{
    myclass *p[3];
    int i;
    for(i=0;i<3;i++)
    {
        p[i]=new myclass(i);
        p[i]->setvalue(p[i]->getval()*2);

    }
   for(i=0;i<3;i++)
    delete p[i];
   cout<<endl;

    return 0;
}

#include <iostream>
using namespace std;
class AA
{
  public:
      AA(int i,int j)
      {
          A=i;
          B=j;
          cout<<"constructor\n";
      }
    AA(AA &obj)
    {
        A=obj.A+1;
        B=obj.B+2;
        cout<<"copyconstructor\n";
    }
    ~AA()
    {
        cout<<"destructor\n";
    }
    void print()
    {
        cout<<"A="<<A<<",B="<<B<<endl;
    }


  private:
    int A,B;


};


int main()
{

    AA a1(2,3);
    AA a2(a1);
    a2.print();
    AA *pa=new AA(5,6);
    pa->print();
    delete pa;

    return 0;
}

动态内存分配和回收

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原文地址：http://blog.csdn.net/zhangzhangjiejie/article/details/51355654