求救 下面C++有说明错误

#include <iostream>
using namespace std;
class base {
     public:
         base() : n(0) {cout << "Initializing default!" << endl ;}
         base(int m) : n(m) {cout << "Initializing!" <<endl;}
     private:
         int n;
};
int main(void)
{
     base x = 1;
     base y = x;
     return 0;
}