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Full Discussion: lvalue question [solved]
Top Forums Programming lvalue question [solved] Post 302584966 by faizlo on Tuesday 27th of December 2011 03:42:00 AM
Old 12-27-2011
lvalue question [solved]
Hi,

This code was originally to print a sine function table. I modified it to print a tangent function table. I got an "lvalue" error which I can't solve...Any hint on why am I getting this error?

Here is the code:
Code:
// sintab.cpp
// Creates a tangent function table
#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

#define PI      3.1415926536
#define START   0.0                      // Lower limit
#define END     (2.0 * PI)               // Upper limit
#define STEP    (PI / 8.0)               // Step width
#define HEADER  (cout << " ***** Tangent Function Table *****\n\n")
int main()
{
  HEADER;                                // Title
                                         // Table Head:
  double x;
  cout << setw(16) << "x" << setw(20) << "tan(x)\n"
       << "-----------------------------------------"
       << fixed << endl;
  
  for( x = START; x < END + STEP/2; x += STEP)
    {
      if ( x = 0.5 * PI || x = 1.5 * PI )
        cout << "tangent is undefined." << endl;
      else
        cout << setw(20) << x << setw(16) << tan(x) << endl << endl << endl;
    }
  return 0;
}

---------- Post updated 12-27-11 at 02:42 AM ---------- Previous update was 12-26-11 at 11:30 PM ----------

OK I got it. It's a stupid mistake, I should have used
Code:
if ( x == 0.5 * PI || x == 1.5 * PI )

instead of the one used above.
 

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LEARN ABOUT DEBIAN

brlapi_gettty

Deprecated names(3)						      BrlAPI						       Deprecated names(3)

NAME

       Deprecated names -

   Data Structures
       struct brlapi_writeStruct

   Macros
       #define brlapi_settings_t   brlapi_connectionSettings_t
       #define BRLAPI_WRITESTRUCT_INITIALIZER	BRLAPI_WRITEARGUMENTS_INITIALIZER
       #define brl_keycode_t   brlapi_keyCode_t
       #define brl_type_t   brlapi_packetType_t
       #define BRLCOMMANDS   NULL
       #define BRL_KEYCODE_MAX	 BRLAPI_KEY_MAX
       #define brlapi_initializeConnection   brlapi_openConnection
       #define brlapi_getTty   brlapi_enterTtyMode
       #define brlapi_getTtyPath   brlapi_enterTtyModeWithPath
       #define brlapi_leaveTty	 brlapi_leaveTtyMode
       #define brlapi_unignoreKeyRange	 brlapi_acceptKeyRange
       #define brlapi_unignoreKeySet   brlapi_acceptKeySet
       #define brlapi_getRaw   brlapi_enterRawMode
       #define brlapi_leaveRaw	 brlapi_leaveRawMode
       #define brlapi_suspend	brlapi_suspendDriver
       #define brlapi_resume   brlapi_resumeDriver
       #define BRLERR_SUCCESS	BRLAPI_ERROR_SUCCESS
       #define BRLERR_NOMEM   BRLAPI_ERROR_NOMEM
       #define BRLERR_TTYBUSY	BRLAPI_ERROR_TTYBUSY
       #define BRLERR_DEVICEBUSY   BRLAPI_ERROR_DEVICEBUSY
       #define BRLERR_UNKNOWN_INSTRUCTION   BRLAPI_ERROR_UNKNOWN_INSTRUCTION
       #define BRLERR_ILLEGAL_INSTRUCTION   BRLAPI_ERROR_ILLEGAL_INSTRUCTION
       #define BRLERR_INVALID_PARAMETER   BRLAPI_ERROR_INVALID_PARAMETER
       #define BRLERR_INVALID_PACKET   BRLAPI_ERROR_INVALID_PACKET
       #define BRLERR_CONNREFUSED   BRLAPI_ERROR_CONNREFUSED
       #define BRLERR_OPNOTSUPP   BRLAPI_ERROR_OPNOTSUPP
       #define BRLERR_GAIERR   BRLAPI_ERROR_GAIERR
       #define BRLERR_LIBCERR	BRLAPI_ERROR_LIBCERR
       #define BRLERR_UNKNOWNTTY   BRLAPI_ERROR_UNKNOWNTTY
       #define BRLERR_PROTOCOL_VERSION	 BRLAPI_ERROR_PROTOCOL_VERSION
       #define BRLERR_EOF   BRLAPI_ERROR_EOF
       #define BRLERR_EMPTYKEY	 BRLAPI_ERROR_EMPTYKEY
       #define BRLERR_DRIVERERROR   BRLAPI_ERROR_DRIVERERROR

Detailed Description
       With version 0.5.0, BrlAPI is now provided through including <brlapi.h> and got a big renaming pass. Old names are still available through
       macros, but they are deprecated since they will get dropped in the next release. This documentation is for you to know the new names.

       For checking that you have completely switched to new names, just define BRLAPI_NO_DEPRECATED: that will disable compatibility macros.

Macro Definition Documentation
   #define BRL_KEYCODE_MAX   BRLAPI_KEY_MAX
   #define brl_keycode_t   brlapi_keyCode_t
   #define brl_type_t	brlapi_packetType_t
   #define brlapi_getRaw   brlapi_enterRawMode
   #define brlapi_getTty   brlapi_enterTtyMode
   #define brlapi_getTtyPath   brlapi_enterTtyModeWithPath
   #define brlapi_initializeConnection	 brlapi_openConnection
   #define brlapi_leaveRaw   brlapi_leaveRawMode
   #define brlapi_leaveTty   brlapi_leaveTtyMode
   #define brlapi_resume   brlapi_resumeDriver
   #define brlapi_settings_t   brlapi_connectionSettings_t
   #define brlapi_suspend   brlapi_suspendDriver
   #define brlapi_unignoreKeyRange   brlapi_acceptKeyRange
   #define brlapi_unignoreKeySet   brlapi_acceptKeySet
   #define BRLAPI_WRITESTRUCT_INITIALIZER   BRLAPI_WRITEARGUMENTS_INITIALIZER
   #define BRLCOMMANDS	 NULL
   #define BRLERR_CONNREFUSED	BRLAPI_ERROR_CONNREFUSED
   #define BRLERR_DEVICEBUSY   BRLAPI_ERROR_DEVICEBUSY
   #define BRLERR_DRIVERERROR	BRLAPI_ERROR_DRIVERERROR
   #define BRLERR_EMPTYKEY   BRLAPI_ERROR_EMPTYKEY
   #define BRLERR_EOF	BRLAPI_ERROR_EOF
   #define BRLERR_GAIERR   BRLAPI_ERROR_GAIERR
   #define BRLERR_ILLEGAL_INSTRUCTION	BRLAPI_ERROR_ILLEGAL_INSTRUCTION
   #define BRLERR_INVALID_PACKET   BRLAPI_ERROR_INVALID_PACKET
   #define BRLERR_INVALID_PARAMETER   BRLAPI_ERROR_INVALID_PARAMETER
   #define BRLERR_LIBCERR   BRLAPI_ERROR_LIBCERR
   #define BRLERR_NOMEM   BRLAPI_ERROR_NOMEM
   #define BRLERR_OPNOTSUPP   BRLAPI_ERROR_OPNOTSUPP
   #define BRLERR_PROTOCOL_VERSION   BRLAPI_ERROR_PROTOCOL_VERSION
   #define BRLERR_SUCCESS   BRLAPI_ERROR_SUCCESS
   #define BRLERR_TTYBUSY   BRLAPI_ERROR_TTYBUSY
   #define BRLERR_UNKNOWN_INSTRUCTION	BRLAPI_ERROR_UNKNOWN_INSTRUCTION
   #define BRLERR_UNKNOWNTTY   BRLAPI_ERROR_UNKNOWNTTY
Author
       Generated automatically by Doxygen for BrlAPI from the source code.

Version 1.0							  Fri Jun 7 2013					       Deprecated names(3)
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