48 lines
917 B
C++
48 lines
917 B
C++
//设计一个计数器counter，用类成员重载自增运算符实现计数器的自增，用友元重载实现计数器的自减。
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#include<iostream>
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using namespace std;
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class Counter{
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private:
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int n;
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public:
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Counter(int i=0):n(i){};
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Counter operator++();
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Counter operator++(int);
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friend Counter operator--(Counter &c);
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friend Counter operator--(Counter &c,int);
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void display();
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};
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Counter Counter::operator++(){
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++n;
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return *this;
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}
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Counter Counter::operator++(int){
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n++;
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return *this;
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}
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Counter operator--(Counter &c){
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--c.n;
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return c;
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}
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Counter operator--(Counter &c,int){
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c.n--;
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return c;
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}
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void Counter::display(){
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cout<<"counter number="<<n<<endl;
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}
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int main(int argc, char const *argv[])
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{
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Counter a;
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++a;
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a.display();
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a++;
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a.display();
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--a;
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a.display();
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a--;
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a.display();
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system("pause");
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return 0;
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}
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