Show the code:

#include<iostream>
using namespace std;
namespace CounterNameSpace {
int upperbound;
int lowerbound;
class Counter {
    int count;
public:
Counter(int n) {
    if (n <= upperbound) {
        count = n;
    } else {
        count = upperbound;
    }
}

void reset(int n) {
    if (n < upperbound) {
        count = n;
    }
}
int run() {
    if (count > lowerbound) {
        return count--;
    } else {
        return lowerbound;
    }
}
};
}
int main() {
CounterNameSpace::upperbound = 100;
CounterNameSpace::lowerbound = 0;
CounterNameSpace::Counter obj1(10);

int i;
do {
    i = obj1.run();
    cout << i << ",";
} while (i > CounterNameSpace::lowerbound);
cout << endl;

return 0;
}

[C++] 基础知识点：namespace