4elist1013.cpp

来自「《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。」· C++ 代码 · 共 46 行

// Listing 10.13
// Add function

#include <iostream.h>

using namespace std;

class Counter
{
public:
   Counter();
   Counter(int initialValue);
   ~Counter(){}
   int GetItsVal()const { return itsVal; }
   void SetItsVal(int x) {itsVal = x; }
   Counter Add(const Counter &);

private:
   int itsVal;

};

Counter::Counter(int initialValue):
itsVal(initialValue)
{}

Counter::Counter():
itsVal(0)
{}

Counter Counter::Add(const Counter & rhs)
{
   return Counter(itsVal+ rhs.GetItsVal());
}

int main()
{
   Counter varOne(2), varTwo(4), varThree;
   varThree = varOne.Add(varTwo);
   cout << "varOne: " << varOne.GetItsVal()<< endl;
   cout << "varTwo: " << varTwo.GetItsVal() << endl;
   cout << "varThree: " << varThree.GetItsVal() << endl;

 return 0;
}