填空题 下列程序的输出结果是 1。
#include＜iostream＞
using namespace std;
class Base{
public:
int m,n;
Base(int i,int j):m(i),n(j){}
};
class Derived:public Base{
public:
int m,k;
Derived(int i,int j)：Base(i,j),m(i+1),k(j+1){}
};
int main(){
Derived d(1,5);
cout＜＜d.m＜＜d.k＜＜d.n;
return 0;
}