Page726_bitset.cpp

#include <cstddef>
#include <iostream>
#include <string>
#include <bitset>
#include <stdexcept>
using std::size_t;
using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::bitset;
using std::overflow_error;
int main()
{
    bitset<32> bitvec(1U); // 32bits; low-order bit is 1, remaining bits are 0
    bool is_set = bitvec.any();      // true, one bit is set
    bool is_not_set = bitvec.none(); // false, one bit is set
    bool all_set = bitvec.all();     // false, only one bit is set
    size_t onBits = bitvec.count();  // return 1
    size_t sz = bitvec.size();       // return 32
    cout << onBits << "\n" << sz << endl;
    bitvec.flip();  // reverses the value of all the bits in bitvec
    cout << bitvec << endl;
    bitvec.reset(); // sets all the bits to 0
    cout << bitvec << endl;
    bitvec.set();   // sets all the bits to 1
    cout << bitvec << endl;
    bitvec.flip(0);   // reverses the value of the first bit
    cout << bitvec << endl;
    bitvec.set(bitvec.size() - 1); // turns on the last bit
    cout << bitvec << endl;
    bitvec.set(0, 0); // turns on the first bit
    cout << bitvec << endl;
    bitvec.reset(3);  // turns on the third bit
    cout << bitvec << endl;
    bitvec.test(0);   // returns false because the first bit is off
    cout << bitvec << endl;
    bitvec[0] = 0;          // turn off the bit at position 0
    cout << bitvec << endl;
    bitvec[31] = bitvec[0]; // set the last bit to the same value as the first bit
    cout << bitvec << endl;
    bitvec[0].flip();       // flip the value of the bit at position 0
    cout << bitvec << endl;
    ~bitvec[0];             // equivalent operation; flip the bit at position 0
    cout << bitvec << endl;
    bool b = bitvec[0];     // convert the value of bitvec[0] to bool
    try {
        bitset<128> bitvec3(~0ULL);
        unsigned long ulong  = bitvec3.to_ulong(); // error: overflow
    } catch(overflow_error err) {
        cout << err.what() << endl;
    }
    bitset<16> bits;
    cin >> bits; // read up to 16 1 or 0 character from cin
    cout << "bits: " << bits << endl; // print what we just reads
    return 0;
}