C + + IO format Controller

1. Functions of the IO controller that do not require parameters are defined in <iosteram>, including Dec,oct and Hex. Also includes ws,endl,ends and flush as well as the contents shown.

2, the need for parameters of the controller defined in the <iomainip> header file, like the following predefined controller

3. Below is an example program using IO Controller

   1:  #include <fstream>

   2:  #include <iomanip>

   3:  usingnamespace std;

   4:  

   5:  int main () {

   6:    ofstream TRC ("Trace.out");

   7:    int i = 47;

   8:    float f = 2300114.414159;

   9:    char"is there any more?";

  Ten:  

One   :    TRC << setiosflags (

/*| Ios::stdio *   ///           ?????

  :           | ios::showbase | ios::uppercase

  :           | ios::showpos);

  :    //Default to Dec

  :    TRC << hex << i << Endl;

  :    TRC << resetiosflags (ios::uppercase)

  :      << Oct << i << Endl;

  :    trc.setf (Ios::left, Ios::adjustfield);

  :    TRC << resetiosflags (ios::showbase)

  :      << Dec << setfill (' 0 ');

  :    "fill char:" << Trc.fill () << Endl;

At   :    TRC << SETW (Ten) << i << Endl;

  :    trc.setf (ios::right, Ios::adjustfield);

  :    TRC << SETW (Ten) << i << Endl;

  :    trc.setf (iOS::internal, Ios::adjustfield);

  :    TRC << SETW (Ten) << i << Endl;

  :    //Without SETW (TEN)

  £ º  

  :    TRC << resetiosflags (Ios::showpos)

  :      << setiosflags (ios::showpoint)

  :      "prec =" << trc.precision () << Endl;

  :    trc.setf (ios::scientific, Ios::floatfield);

  :    trc << F << Endl;

  :    trc.setf (iOS::fixed, Ios::floatfield);

  :    trc << F << Endl;

  Panax notoginseng  :  //Automatic

  :    trc << F << Endl;

  :    TRC << setprecision (20);

Max   :    "prec =" << trc.precision () << Endl;

In   :    trc << F << Endl;

  :    trc.setf (ios::scientific, Ios::floatfield);

  :    trc << F << Endl;

  :    trc.setf (iOS::fixed, Ios::floatfield);

  :    trc << F << Endl;

  :    //Automatic

  :    trc << F << Endl;

  :  

In   :    TRC << setw << s << endl;

  :    TRC << setw (+) << s << Endl;

  Wuyi:    trc.setf (Ios::left, Ios::adjustfield);

  :    TRC << setw (+) << s << Endl;

  :  

A   :    TRC << resetiosflags (

  :           ios::showpoint | ios::unitbuf

  £ º           //| Ios::stdio//?????????

  £ º   );

  :  }///:~

4. Enter the following

+47
0X2F
057
Fill char:0
+470000000
0000000+47
+000000047
+47
Prec = 6
2.300115e+006
2300114.500000
2.30011e+006
Prec = 20
2300114.5000000000000
2.30011450000000000000e+006
2300114.50000000000000000000
2300114.5000000000000
Is there any more?
0000000000000000000000Is there any more?
Is there any more?0000000000000000000000

C + + IO format Controller