std::internal is a stream manipulator to let padding spaces of a negative number be put between the minus and its digits.


#include <iomanip>

#include <iostream>



int main ()

{

  const int x = -12;

  std::cout

    << std::setw(4)  << std::internal << x << '\n'

    << std::setw(4)  << std::left     << x << '\n'

    << std::setw(4)  << std::right    << x << '\n';

}

Screen output:

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(C++) std::internal