The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
#include <iostream>
#include <sstream>
int main()
{
// create string stream for formatted writing
std::ostringstream os;
// write integral value in decimal and hexadecimal forms
os << "dec: " << 15 << std::hex << " hex: " << 15 << std::endl;
// output string stream as string
std::cout << os.str() << std::endl;
// append floating-point number
os << "float: " << 4.67 << std::endl;
// output string stream as string
std::cout << os.str() << std::endl;
// overwrite the beginning of the string stream with octal value
os.seekp(0);
os << "oct: " << std::oct << 15;
// output string stream as string
std::cout << os.str() << std::endl;
}