fig06_04.cpp

《c＋＋大学教程》源码

// Fig. 6.4: fig06_04.cpp
// Demonstrating the class member access operators . and ->
//
// CAUTION: IN FUTURE EXAMPLES WE AVOID PUBLIC DATA!
#include <iostream>

using std::cout;
using std::endl;

// class Count definition
class Count {

public:
   int x;

   void print() 
   { 
      cout << x << endl; 
   }

}; // end class Count

int main()
{
   Count counter;                // create counter object 
   Count *counterPtr = &counter; // create pointer to counter
   Count &counterRef = counter;  // create reference to counter

   cout << "Assign 1 to x and print using the object's name: ";
   counter.x = 1;       // assign 1 to data member x
   counter.print();     // call member function print

   cout << "Assign 2 to x and print using a reference: ";
   counterRef.x = 2;    // assign 2 to data member x
   counterRef.print();  // call member function print

   cout << "Assign 3 to x and print using a pointer: ";
   counterPtr->x = 3;   // assign 3 to data member x
   counterPtr->print(); // call member function print

   return 0;  

} // end main

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