C++ primer第九章一道练习题

文件A：

#include "iostream"
using namespace std;
void other();
void another();
int x=10;
int y;
int main(){
    cout<<x<<endl;
    {
        int x=4;
        cout<<x<<endl;
        cout<<y<<endl;
    }
    other();
    another();
    return  0;
}
void other(){
    int y=1;
    cout<<"Other: "<<x<<", "<<y<<endl;
}

文件B：

#include "iostream"
using namespace std;
extern int x;
namespace {
    int y=-4;
}
void another(){
    cout<<"another:"<<x<<", "<<y<<endl;
}

该输出为：

10
4
0
Other: 10, 1
another:10, -4