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
