Create custom ostream operator : output manipulator « Development « C++ Tutorial

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2. Development
3. output manipulator

#include <iostream>
#include <iomanip>
using namespace std; 
ostream &sethex(ostream &stream){
   stream.setf(ios::showbase);
   stream.setf(ios::hex);
   return stream;
}

int main(void){
   cout << 256 << "   " << sethex << 256;
}