指针 * &

 int main()
 {
 int updates=;   //定义int变量updates
 int * p_updates; //定义指针p_updates
 p_updates=&updates;//将updates的地址赋给指针p_upfates

 cout<<"value:update="<<updates<<endl;  //updates=6
 cout<<"*p_updates="<<*p_updates<<endl; //*p_updates为地址中存储的值 即6

 cout<<"address:&updates="<<&updates<<endl; //&update 取地址
 cout<<"p_updates="<<p_updates<<endl;  //p_updates 地址值

 *p_updates=*p_updates+; //地址中存储的值加1 即6+1=7
 cout<<"now updates="<<updates<<endl; //update=7
 system("pause");
 return ;
 }

 int main()
 {
 int higgens=;
 int *pt=&higgens;

 cout<<"value of higgens="<<higgens<<endl;  //
 cout<<"address of higgens="<<&higgens<<endl;  //地址
 cout<<"value of *pt="<<*pt<<endl; //
 cout<<"value of pt="<<pt<<endl;  //地址
 system("pause");
 }

 int main()
 {
     double * p3=new double [];//定义一个double类型的指针
     p3[]=0.2;
     p3[]=0.5;
     p3[]=0.8;
     cout<<"p3[1] is"<<p3[]<<endl;  //p3当做数组名使用，p3[1]为第二个元素
     p3=p3+;//修改指针的值，+1之后p3[0]指向的是之前的第二个值
     cout<<"now p3[0] is"<<p3[]<<endl;
     cout<<"p3[1] is"<<p3[]<<endl;
     p3=p3-; //为delete []提供正确的地址
     delete [] p3;

     system("pause");
     return ;
 }

 int main()
 {
     double wages[]={10000.0,20000.0,30000.0};
     short stacks[]={,,};
     double *pw=wages;
     short *ps=&stacks[];

     cout<<"pw="<<pw<<",*pw="<<*pw<<endl;
     pw=pw+;
     cout<<"pw="<<pw<<",*pw="<<*pw<<endl;
     cout<<"ps="<<ps<<",*ps="<<*ps<<endl;
     ps=ps+;
     cout<<"ps="<<ps<<",*ps="<<*ps<<endl;
     cout<<"stacks[0]="<<stacks[]<<",stacks[1]="<<stacks[]<<endl;
     cout<<"*stacks="<<*stacks<<",*(stacks+1)="<<*(stacks+)<<endl;

     cout<<sizeof(wages)<<"=size of wages array"<<endl;//数组长度 3*8=24
     cout<<sizeof(pw)<<"=size of pw pointer"<<endl; //指针长度 4  在32位机上，所有指针类型变量占用内存字节数都为4 ，64位机指针占用的内存大小为8个字节
     system("pause");
     return ;
 }