std::uppercase is a stream manipulator: when a number's base and/or non-decimal digits are show, std::uppercase displays these in uppercase.


#include <iostream>



int main()

{

  const int x = 255; //0xFF

  std::cout

    << std::showbase

    << std::hex

    << std::uppercase   << x << '\n'

    << std::nouppercase << x << '\n';

}

Screen output:


0XFF

0xff

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(C++) std::uppercase