calc.cpp

用于词法分析的词法分析器

/*
  $Id: calc.cpp,v 1.3 1997/05/19 02:19:20 matt Exp $

  calc application.  Implements a calculator using CalcParser.
  
  (c) Matt Phillips, 1997.  */

#include <strstream.h>

#include "CalcParser.h"

int main ()
{
  char line [80];

  cout << "Enter an expression: ";

  // Read a line from cin.
  cin.getline (line, 80);

  // Run it through the parser.
  istrstream stream (line);
  CalcParser parser (stream);

  // Print errors or result.
  if (parser.ok ())
    cout << "Result: " << parser.getResult () << endl;
  else
    cout << parser.getErrors () << endl;
  
  return 0;
}