Make ostringstream work with decimal, hexadecimal value, floating value, bitset : ostrstream « File Stream « C++ Tutorial

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/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <iostream>
#include <sstream>
#include <bitset>
using namespace std;

int main()
{
    ostringstream os;

    // decimal and hexadecimal value
    os << "dec: " << 15 << hex << " hex: " << 15 << endl;
    cout << os.str() << endl;

    // append floating value and bitset
    bitset<15> b(5789);
    os << "float: " << 4.67 << " bitset: " << b << endl;

    // overwrite with octal value
    os.seekp(0);
    os << "oct: " << oct << 15;
    cout << os.str() << endl;
}

dec: 15 hex: f

oct: 17 hex: f
float: 4.67 bitset: 001011010011101