std::bitset

[c++]代码库

// std::bitset
#include <bitset>
#include <iostream>
#include <string>

int main() {
	using namespace std;

	// instantiate a bitset object for holding 4 bits
	// all initialized to '0000'
	bitset<4> fourBits;
	cout << "The initial contents of fourBits: " << fourBits << endl;

	// instantiate a bitset object for holding 5 bits
	// initialize it to a bit sequence supplied by a string
	bitset<5> fiveBits(string("10101"));
	cout << "The initial contents of fiveBits: " << fiveBits << endl;

	// instantiate a bitset object for 8 bits
	// given an unsigned long init value
	bitset<8> eightbits(255);
	cout << "The initial contents of eightBits: " << eightbits << endl;

	return 0;
}