C++ primer 习题练习：6.24

#include<iostream>
#include<bitset>
#include<stdexcept>
using namespace std;
int main()
{
	bitset<100> bs;
	for(size_t ix = 0; ix != bs.size(); ++ix)
	{
		bs[ix] = 1;
	}
	try
	{
		bs.to_ulong();//将bs转化为unsigned long 类型
	}
	catch(runtime_error err)
	{
		cout << "err!!!" << endl;
		cout << err.what() <<  endl;
	}
	return 0;
}