halluc1nati0n

#include <bitset>
#include <iostream>
#include <string>
#include <sstream>
using namespace std;

int main ()
{

    const char* const str = "0x31c3";
    std::istringstream iss(str);
    int i;
    iss >> std::hex >> i;
    if(!iss && !iss.eof()) throw "dammit!";
    std::cout << '"' << str << "\": " << i << "(0x" << std::hex << i << ")\n";
    bitset<16> bs=i;
    cout << "Binary : " << bs.to_string<char,char_traits<char>,allocator<char> >() << endl;
                 // to_string returns an std::string with the binary digits ( 000...0111 )
    return 0;

}