关于c++ bitset

bitset 的下标计数问题

example:

#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");
}

运行这个程序可以看到虽然bitset的pattern在屏幕上是从右边开始的，也就是5的bitset是0000...00101

但是在下标上，bs[0]=1, bs[1]=0, bs[2]=1, ...

而不是bs[31]=1, bs[30]=0, bs[29]=1