重载

#include <iostream>  using namespace std;  class A{private:int n;public:A();A(int n);void show();};A::A(){cout << "call A()" << this << endl;n = 100;}A::A(int n){cout << "call A(int n)" << this << endl;this->n = n;}void A::show(){cout << "n=" << n << endl;}int main(){A a1;A a2(200);a1.show();a2.show();return 0;}