c15_07.cpp

it can help you use C++ program we

#include <iostream >
using namespace std;

class CCounter
{
public:
	CCounter():m_val(0){ }
	CCounter(unsigned initVal):m_val(initVal){ }
	~CCounter(){}

	unsigned GetVal()const { return m_val; }  
	void SetVal(unsigned x) {m_val = x; }
	CCounter Add(const CCounter &cnt);
private:
	unsigned m_val;
};

CCounter CCounter::Add(const CCounter & cnt)
{
	CCounter temp;
	temp.SetVal(m_val+ cnt.GetVal());
	return temp;
}

int main()
{
	CCounter counter1(1), counter2(3), counter3;//创建三个CCounter类对象
	counter3 = counter1.Add(counter2);	//调用成员函数Add( )
	cout << "counter1的值是: " << counter1.GetVal() << endl;
	cout << "counter2的值是: " << counter2.GetVal() << endl;
	cout << "counter3=counter1+counter2的值是: " << counter3.GetVal() << endl;

	return 0;
}