关于c++ bitset

#include<bitset>
#include<iostream>
using std::cout;
using std::endl;
using std::bitset;
void main()
{
    const int num = 5;
    bitset<32> bs = bitset<32>(num);
    cout << bs << endl;
    cout << bs[0] << "," << bs[1] << "," << bs[2] << endl;
    cout << bs[31] << "," << bs[30] << "," << bs[29] << endl;
    system("pause");
}