include/AD/numeric/bcd.h

   1 //////////////////////////////////////////////////////////////////////////////
   2 // NOTICE:
   3 //
   4 // ADLib, Prop and their related set of tools and documentation are in the
   5 // public domain.   The author(s) of this software reserve no copyrights on
   6 // the source code and any code generated using the tools.  You are encouraged
   7 // to use ADLib and Prop to develop software, in both academic and commercial
   8 // settings, and are free to incorporate any part of ADLib and Prop into
   9 // your programs.
  10 //
  11 // Although you are under no obligation to do so, we strongly recommend that
  12 // you give away all software developed using our tools.
  13 //
  14 // We also ask that credit be given to us when ADLib and/or Prop are used in
  15 // your programs, and that this notice be preserved intact in all the source
  16 // code.
  17 //
  18 // This software is still under development and we welcome any suggestions
  19 // and help from the users.
  20 //
  21 // Allen Leung
  22 // 1994
  23 //////////////////////////////////////////////////////////////////////////////
  24
  25 #ifndef binary_coded_decimal_h
  26 #define binary_coded_decimal_h
  27
  28 #include <iostream.h>
  29 #include <AD/generic/generic.h>
  30
  31 ///////////////////////////////////////////////////////////////////////////
  32 //  Class BCD
  33 ///////////////////////////////////////////////////////////////////////////
  34
  35 class BCD {
  36
  37    char * digits;
  38
  39 public:
  40
  41    ////////////////////////////////////////////////////////////////////////
  42    //  Constructor and destructor
  43    ////////////////////////////////////////////////////////////////////////
  44    BCD();               // e.g. BCD n;
  45    BCD(long);           // e.g. BCD n = 1234;
  46    BCD(const BCD&);     // e.g. BCD n = m;
  47   ~BCD();
  48
  49    ////////////////////////////////////////////////////////////////////////
  50    //  Conversion
  51    ////////////////////////////////////////////////////////////////////////
  52    operator const char * () const { return digits; }
  53
  54    ////////////////////////////////////////////////////////////////////////
  55    //  Assignment
  56    ////////////////////////////////////////////////////////////////////////
  57    BCD& operator = (long);
  58    BCD& operator = (const BCD&);
  59
  60    ////////////////////////////////////////////////////////////////////////
  61    //  Selectors
  62    ////////////////////////////////////////////////////////////////////////
  63    char operator [] (int i) const { return digits[i+1]; }
  64
  65    ////////////////////////////////////////////////////////////////////////
  66    //  Arithmetic
  67    ////////////////////////////////////////////////////////////////////////
  68    BCD operator - ();
  69    friend BCD operator + (const BCD&, const BCD&);
  70    friend BCD operator - (const BCD&, const BCD&);
  71    friend BCD operator * (const BCD&, const BCD&);
  72    friend BCD operator / (const BCD&, const BCD&);
  73
  74    ////////////////////////////////////////////////////////////////////////
  75    //  Comparison
  76    ////////////////////////////////////////////////////////////////////////
  77    friend Bool operator == (const BCD&, const BCD&);
  78    friend Bool operator != (const BCD&, const BCD&);
  79    friend Bool operator >  (const BCD&, const BCD&);
  80    friend Bool operator <  (const BCD&, const BCD&);
  81    friend Bool operator >= (const BCD&, const BCD&);
  82    friend Bool operator <= (const BCD&, const BCD&);
  83
  84    ////////////////////////////////////////////////////////////////////////
  85    //  I/O
  86    ////////////////////////////////////////////////////////////////////////
  87    friend ostream& operator << (ostream&, const BCD&);
  88    friend istream& operator >> (istream&, BCD&);
  89 };
  90
  91 #endif