addfunction.cpp

《24学时精通c++》的光盘内容

 // Listing 14.4
 // Add function
 #include <iostream>
 
 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);
     std::cout << "varOne: " << varOne.GetItsVal()<< std::endl;
     std::cout << "varTwo: " << varTwo.GetItsVal() << std::endl;
     std::cout << "varThree: " << varThree.GetItsVal() 
         << std::endl;
     return 0;
 }