Using stream-manipulator showbase to show number base : cout « Development « C++ Tutorial

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2. Development
3. cout

#include <iostream>
using std::cout;
using std::endl;
using std::hex;
using std::oct;
using std::showbase;

int main()
{
   int x = 100;

   cout << "Printing integers preceded by their base:" << endl << showbase;

   cout << x << endl; // print decimal value
   cout << oct << x << endl; // print octal value
   cout << hex << x << endl; // print hexadecimal value
   return 0;
}

Printing integers preceded by their base:
100
0144
0x64