setw manipulator is useful when repeated field : double output « Data Types « C++ Tutorial

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3. double output

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
  cout << "Default format: " << 123.123456789 << endl;

  cout << "setw manipulator is useful when repeated field\n"
       << "widths must be specified. For example:\n";
  cout << setw(8) << "this" << endl <<  setw(8) << "is" << endl
       << setw(8) << "a" << endl << setw(8) << "column" << endl
       << setw(8) << "of" << endl << setw(8) << "words";

  return 0;
}