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

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C++ Tutorial » Data Types » double output 
2.8.4.setw manipulator is useful when repeated field
#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;
}
2.8.double output
2.8.1.Precision of double: setprecision
2.8.2.Use a field width of 20
2.8.3.After setting the showpos and showpoint flags
2.8.4.setw manipulator is useful when repeated field
2.8.5.Return to default format
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