Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: enum and C preprocessor
Top Forums Programming enum and C preprocessor Post 302556287 by Corona688 on Saturday 17th of September 2011 04:58:59 PM
Old 09-17-2011
enum and C preprocessor
Say I have a list of enumerations I wish to use to select a variable at compile-time:

Code:
enum pins
{
        PIN_A=1,
        PIN_B=7,
        PIN_C=6,
}

int VAR1, VAR2, VAR3, VAR4, VAR5, VAR6, VAR7;

#define PIN_TO_VAR(NUM) VAR ## NUM

int main(void)
{
        PIN_TO_VAR(PIN_A)=32;
}

But this doesn't work, because the macro combines VAR ## NUM into VARPIN_A instead of what I wanted -- value of PIN_A, aka 1, to get VAR1.

The usual trick of #define UNWRAP(X) X doesn't manage to get the value out of the enum, either.

Will I have to just convert all my enums into #define's to get macros to substitute them?
 

8 More Discussions You Might Find Interesting

1. Programming

what is the base type of enum

helo i have asked in exam what that what is the base type of enum options are given bewlo (1) long int (2) short int (3) signed int (4) unsigned int can u tell me what is the exact answer from the above option Regards, Amit (1 Reply)
Discussion started by: amitpansuria
1 Replies

2. IP Networking

DNS ENUM RR interpretation

Hi Guys, This is really really urgent. Am looking out for some quick answers. I'm developing a DNS Resolver client that interprets DNS Query repsonses & pass on the needful to DNS applications. When an ENUM query(modified to an nslookup naptr query) is issued & an NAPTR RR(Resource Record)... (1 Reply)
Discussion started by: smanu
1 Replies

3. Programming

Preprocessor

Hi, Anyone please explain the functionality of ## in c. I didn't get the following preprocessor directives, # define LL(x) x ## LL # define LL(x) x ## i64 Thanks, Naga:cool: (1 Reply)
Discussion started by: Nagapandi
1 Replies

4. Programming

enum in c++

#include <iostream> #include <stdio.h> using namespace std; typedef struct A { enum a{ red,blue,green}a; }obj11; obj11 obj1; int main() { //obj1.a=red; // how to set variable ? cout<<"sizeof struct is n"<<sizeof(obj1); cout<<"obj1.a is"<<obj1.a; if... (1 Reply)
Discussion started by: crackthehit007
1 Replies

5. Programming

Preprocessor __FILE__ for Debugging

Hi, Just wondering if it is possible to trim the file path output by __FILE__ preprocessor in my debugging line. Let's say my main.cpp file is found in C:\User\MyName\SystemA\Mod1\SubMod2\Test\main.cpp for __FILE__, I just want the filename - main.cpp to be printed, instead of the entire... (2 Replies)
Discussion started by: tanlccc
2 Replies

6. Programming

C- trying to code a 'spare array'; 'enum' fauled.

I am trying to implement a spare array in C that would be referenced by regular integers. Right away: define array for maximum possible index elements completely is not what I trying to get!!! It should be a construction that would have just 2 elements if I need to have just two indexes, like... (8 Replies)
Discussion started by: alex_5161
8 Replies

7. Programming

Mixed enum types - coverity defect

Hi All, I came across this error "MIXING ENUM TYPES" when I run my C program against the Coverity Tool. I've made many search relating to the error, but I didnt find the exact solution. Can anyone help me to overcome this.? Thanks in Advance.!! (3 Replies)
Discussion started by: Parameswaran
3 Replies

8. Programming

Use #if not defined with OR boolean logic in preprocessor directives

I am currently using Linux CentOS and programming in FORTRAN 90 using Portland 7.1 compiler. I am able to set in the preprocessor directives a flag called TEST. when I go to use logic in my code i can write #ifdef TEST execute something #endif Furthermore, if I want to negate the... (2 Replies)
Discussion started by: prodigious8
2 Replies

LEARN ABOUT DEBIAN

gtk2::pagesetup

Gtk2::PageSetup(3pm)					User Contributed Perl Documentation				      Gtk2::PageSetup(3pm)

NAME

       Gtk2::PageSetup - wrapper for GtkPageSetup

HIERARCHY

	 Glib::Object
	 +----Gtk2::PageSetup

METHODS

   pagesetup = Gtk2::PageSetup->new
   pagesetup = Gtk2::PageSetup->new_from_file ($file_name)
       o   $file_name (localized file name)

       May croak with a Glib::Error in $@ on failure.

       Since: gtk+ 2.12

   pagesetup = Gtk2::PageSetup->new_from_key_file ($key_file, $group_name)
       o   $key_file (Glib::KeyFile)

       o   $group_name (string or undef)

       May croak with a Glib::Error in $@ on failure.

       Since: gtk+ 2.12

   double = $setup->get_bottom_margin ($unit)
       o   $unit (Gtk2::Unit)

   $setup->set_bottom_margin ($margin, $unit)
       o   $margin (double)

       o   $unit (Gtk2::Unit)

   double = $setup->get_left_margin ($unit)
       o   $unit (Gtk2::Unit)

   $setup->set_left_margin ($margin, $unit)
       o   $margin (double)

       o   $unit (Gtk2::Unit)

   $setup->load_file ($file_name)
       o   $file_name (string)

       May croak with a Glib::Error in $@ on failure.

       Since: gtk+ 2.14

   $setup->load_key_file ($key_file, $group_name)
       o   $key_file (Glib::KeyFile)

       o   $group_name (string or undef)

       May croak with a Glib::Error in $@ on failure.

       Since: gtk+ 2.14

   pageorientation = $setup->get_orientation
   $setup->set_orientation ($orientation)
       o   $orientation (Gtk2::PageOrientation)

   double = $setup->get_page_height ($unit)
       o   $unit (Gtk2::Unit)

   double = $setup->get_page_width ($unit)
       o   $unit (Gtk2::Unit)

   double = $setup->get_paper_height ($unit)
       o   $unit (Gtk2::Unit)

   $setup->set_paper_size_and_default_margins ($size)
       o   $size (Gtk2::PaperSize)

   papersize = $setup->get_paper_size
   $setup->set_paper_size ($size)
       o   $size (Gtk2::PaperSize)

   double = $setup->get_paper_width ($unit)
       o   $unit (Gtk2::Unit)

   double = $setup->get_right_margin ($unit)
       o   $unit (Gtk2::Unit)

   $setup->set_right_margin ($margin, $unit)
       o   $margin (double)

       o   $unit (Gtk2::Unit)

   $setup->to_file ($file_name)
       o   $file_name (localized file name)

       May croak with a Glib::Error in $@ on failure.

       Since: gtk+ 2.12

   $setup->to_key_file ($key_file, $group_name)
       o   $key_file (Glib::KeyFile)

       o   $group_name (string or undef)

       Since: gtk+ 2.12

   double = $setup->get_top_margin ($unit)
       o   $unit (Gtk2::Unit)

   $setup->set_top_margin ($margin, $unit)
       o   $margin (double)

       o   $unit (Gtk2::Unit)

ENUMS AND FLAGS

   enum Gtk2::PageOrientation
       o   'portrait' / 'GTK_PAGE_ORIENTATION_PORTRAIT'

       o   'landscape' / 'GTK_PAGE_ORIENTATION_LANDSCAPE'

       o   'reverse-portrait' / 'GTK_PAGE_ORIENTATION_REVERSE_PORTRAIT'

       o   'reverse-landscape' / 'GTK_PAGE_ORIENTATION_REVERSE_LANDSCAPE'

   enum Gtk2::Unit
       o   'pixel' / 'GTK_UNIT_PIXEL'

       o   'points' / 'GTK_UNIT_POINTS'

       o   'inch' / 'GTK_UNIT_INCH'

       o   'mm' / 'GTK_UNIT_MM'

SEE ALSO

       Gtk2, Glib::Object

COPYRIGHT

       Copyright (C) 2003-2011 by the gtk2-perl team.

       This software is licensed under the LGPL.  See Gtk2 for a full notice.

perl v5.14.2							    2012-05-27						      Gtk2::PageSetup(3pm)
All times are GMT -4. The time now is 04:59 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy