// io/rdbuf2.cpp
#include <iostream>
#include <fstream>

void hexMultiplicationTable (std::streambuf* buffer, int num)
{
    std::ostream hexout(buffer);
    hexout << std::hex << std::showbase;

    for (int i=1; i<=num; ++i) {
        for (int j=1; j<=10; ++j) {
            hexout << i*j << ' ';
        }
        hexout << std::endl;
    }
}   // ÍÅ ÇÀÊÐÛÂÀÅÒ áóôåð

int main()
{
    using namespace std;
    int num = 5;

    cout << "We print " << num
         << " lines hexadecimal" << endl;

    hexMultiplicationTable(cout.rdbuf(),num);

    cout << "That was the output of " << num
         << " hexadecimal lines " << endl;
}