LISTING 3.  Test Program for FuncEval Object


/**********************************************************
*                                                         *
*  Main.cpp                                               *
*                                                         *
*  Test program for FuncEval.                             *
*                                                         *
*                                                         *
*                                                         *
***********************************************************
*                                                         *
*  Copyright 1995  Randy C. Finch                         *
*                                                         *
**********************************************************/


/*--------------  INCLUDES  ----------------*/

#include "FuncEval.hpp"


/*----------  MAIN  ------------*/

void main()
{
   FuncEval *func = new FuncEval;
   double result;
   char *eq;
   double X=0.0, Y=0.0;
   char buffer[128];
   int errnum, errpos, i;
   
   printf("\nFUNCTION EVALUATOR PROGRAM BY RANDY C. FINCH\n\n");
   printf("Enter equation: ");
   eq = gets(buffer);
   while (*eq) {
      errnum = func->Convert((UCHAR *)eq);
      printf("Converted equation: %s\n",eq);
      if (errnum) {
         errpos = func->GetErrPosition();
         printf("                    "); // 20 spaces
         for (i=1;i<errpos;i++) { printf(" "); }
         printf("^%d\n",errpos);
         printf("Error %d: %s",errnum,func->GetSyntaxErrMessage());
      }
      else {
         while (Y != -1.0) {
            printf("Enter X: ");
            X = atof(gets(buffer));
            printf("Enter Y: ");
            Y = atof(gets(buffer));
            result = func->Evaluate(X,Y);
            printf("The result is: %f\n",result);
         }
      }
      Y=0.0;
      printf("\n\nEnter equation: ");
      eq = gets(buffer);
   }
   delete func;
}