
#include 
#include 

using boost::format;
using namespace std;

int main(int argc, char* argv[]) {
    unsigned int hexNum = 0xFFEEDDCC;
    cout << format("Formatting a hex number: %08X") % hexNum << endl;

    cout << format("Positional Specifiers: %3% %1% %2% %1%")
        % 1 % 2 % 3 << endl;

    return 0;
}

prints:

Formatting a hex number: 0xFFEEDDCC
Positional Specifiers: 3 1 2 1