指针的使用

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#include <iostream>
using namespace std;
 
int main ()
{
   int  var = 20;   
   int  *ip, *iq;        
 
   ip = &var;       
 
   cout << "Value of var variable: ";
   cout << var << endl;
 
   
   cout << "Address stored in ip variable: ";
   cout << ip << endl;
 
   
   cout << "Value of *ip variable: ";
   cout << *ip << endl;
  
   var++;
   cout << "var++, then Value of *ip variable: ";
   cout << *ip << endl;
   
   *ip=*ip-10;
   cout<<"*ip-10  equal var-10:   ";
   cout<<var<<' '<<*ip<<endl;
   
   iq=ip;
   cout<<"iq  have the same the Address of ip, so *iq have the same Value of var  ";
   cout<<*iq;
   
   return 0;
}

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#include <iostream>
 using namespace std;
 int main ()
 {
    char  *pc;
    char a='c';
    pc=&a;
    string b="hello";
    string *ps=&b;
    cout << "ptr value is " <<(void *)pc<<endl ;
    cout<<*pc<<endl;
    cout<<ps<<endl;
    cout<<&b;
     return 0;
 }