std::showbase is a stream manipulator to show the number system base. For example, the (hexidecimal) value of '0x11' will be displayed as '0x11'.

The example below shows how to display an integer in hexadecimal, octal and decimal with or without showing the number system base.


#include <iostream>



int main ()

{

  const int x = 100;

  std::cout

    << "The value of x in hex: "

    << std::hex

    << std::showbase

    << x << '\n';

  std::cout

    << "The value of x in oct: "

    << std::oct

    << std::showbase

    << x << '\n';

  std::cout

    << "The value of x in dec: "

    << std::dec

    << std::noshowbase

    << x << '\n';

}

Screen output:


The value of x in hex: 0x64

The value of x in oct: 0144

The value of x in dec: 100

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(C++) std::showbase