std::setfill (3) - Linux Manuals

std::setfill: std::setfill

NAME

std::setfill - std::setfill

Synopsis

Defined in header <iomanip>
template< class CharT >
/*unspecified*/ setfill( CharT c );

When used in an expression out << setfill(c) sets the fill character of the stream out to c.

Parameters

c - new value for the fill character

Return value

Returns an object of unspecified type such that if out is the name of an output stream of type std::basic_ostream<CharT, Traits>, then the expression out << setfill(n) behaves as if the following code was executed:
out.fill(n);

Notes

The current fill character may be obtained with std::ostream::fill

Example

// Run this code

  #include <iostream>
  #include <iomanip>
  int main()
  {
      std::cout << "default fill: " << std::setw(10) << 42 << '\n'
                << "setfill('*'): " << std::setfill('*')
                                    << std::setw(10) << 42 << '\n';
  }

Output:

  default fill: 42
  setfill('*'): ********42