calculator.h

嵌入式linux下的一个高级计算器程序的源码

//   $Id: calculator.h,v 1.3 2002/12/17 15:31:55 gerhard Exp gerhard $

// Define Errornumbers to make it easier to find typos in formulas

#include <stdio.h>

#define   ERR_NOERROR     0
#define   ERR_NOBRACKET   1  
#define   ERR_BRACKETMIS  2
#define   ERR_PREEND      3
#define   ERR_TOOMUCH     4
#define   ERR_NOARG       5
#define   ERR_UNKNOWN     6
#define   ERR_ILLEGAL     7
#define   ERR_FPARAM      8
#define   ERR_DIVZERO     9
#define   ERR_DOMAIN     10
#define   ERR_FKTANZ     11
#define   ERR_PARANZ     12

#ifdef _CALCULATOR_
char     *calculator_errtxt[] = {
  "( missing!", 
  "no function arg",
  "unexpected EOL",
  "too much param",
  "no arguments",
  "unknown function",
  "illegal character",
  "no function param",
  "division by zero",
  "domain",
  "no mem for funtion",
  "number of param"
  };
#else
  extern char *calculator_errtxt[];
#endif

#define CALCULATOR_HISTORY    50
#define CALCULATOR_VARS      100
#define CALCULATOR_FKT        50
#define CALCULATOR_FHISTORY  100

//  Variables Definitions for Calculator Subroutines
typedef struct {
  char     *Name;                  // Name of the Variable
  double    Valu;                  // Calculated Value
  int       Ref;                   // Latest Refernece
 } CALCVAR;

// Function Definition 
typedef struct {
  char     *Name;                  // Name of Function
  char     *Def;                   // Formula of Function
  CALCVAR   Var[CALCULATOR_VARS];  // up to 100 local variables
  int       Vars;                  // variables count
  double    last;                  // last calculated value
  int       RefCnt;                // latest Reference
} CALCFKT;


#ifdef _CALCULATOR_
                                   // List of user-defined functions;
  CALCFKT   CalculatorFkt[CALCULATOR_FKT];   
                                   // the first entry is used for the
                                   // formula analysis and not used 
                                   // for function definitions
  int       CalculatorFktAnz = 0;  // current number of functions 

  double    CalculatorHistory[CALCULATOR_HISTORY];  // result history
  int       CalculatorHistCnt = 0; // number of entries in result history

  int       CalculatorError  = 0;  // last Error
  int       CalculatorLevel  = 0;  // nesting level 
  double    CalculatorZero   = 0.; // predefined Zero-Value
  double    CalculatorRes    = 0.; // last result for function ANS
  int       CalculatorRad    = 1;  // Flag for RAD/DEG in trig. functions
  int       CalculatorFmt    = 1;  // Flag for format of resultdisplay
  int       CalculatorAutoAns = 1;
  int       CalculatorAutoHighlight = 1;
  double    CalculatorPI     = 3.141592653589793;
  char     *CalculatorCmdHistory[CALCULATOR_FHISTORY];
  int       CalculatorCmdHistoryAnz;      // ehem ihist
  int       CalculatorCmdCurhist;
#else
  extern CALCFKT   CalculatorFkt[CALCULATOR_FKT];
  extern int       CalculatorFktAnz;

  extern double    CalculatorHistory[CALCULATOR_HISTORY];
  extern int       CalculatorHistCnt;

  extern int       CalculatorError;
  extern int       CalculatorLevel;
  extern double    CalculatorZero;
  extern double    CalculatorRes;
  extern int       CalculatorRad;
  extern int       CalculatorFmt;
  extern int       CalculatorAutoAns;
  extern int       CalculatorAutoHighlight;
  extern double    CalculatorPI;
  extern char     *CalculatorCmdHistory[CALCULATOR_FHISTORY];
  extern int       CalculatorCmdHistoryAnz;      // ehem ihist
  extern int       CalculatorCmdCurhist;
#endif

void
InsertVariable(char *name, double var);

double
CalculateFkt(char *text, int *end, CALCFKT *cal);

double 
Calculator(char *formel, CALCFKT *cal);

double
Calculate_Formula (char *formula);

void
WriteHistory (FILE *config);

void
ReadHistory (FILE *config);

//  Local Variables: ***
//  mode:c++ ***
//  End: ***