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Full Discussion: Extern variable.
Top Forums Programming Extern variable. Post 302217936 by Tanvirk on Thursday 24th of July 2008 12:50:52 AM
Old 07-24-2008
Extern variable.
file1.c

Code:
int a1;
int main()
{
        a1 = 2;
        printf("\na1 = %d\n", a1);
        next();
        printf("\na1 = %d\n", a1);
        next1();
        printf("\na1 = %d\n", a1);
}

file2.c
Code:
#include <stdio.h>

int b1 = 0;
void next(void)
{
        char a1;

        a1 = 'a';
        b1 = 77;
}


file3.c

Code:
int a1;
void next1(void)
{
        float b1;

        b1 = 20.3;
        a1 = 15;
}


When i compile it using gcc -c and create separate respective object file
-and try to link them it dosent give any errors as to "multiple declaration of variable" as of "variable a" in this case.

-And it gets comiled and linked successfully.
-also the "third printf" in file1.c prints the value of a=15 which is updated by file3.c.
-whereas its nowhere specified in file3.c that variable "a is an exterm variable"
in that case file1.c would printf the value of a1=15;
-so.................???????????????????????


Regards
Tanvir


Moved to High Level Programming Forum. FPMurphy
Last edited by vino; 07-24-2008 at 06:36 AM.. Reason: added code tags
 

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LEARN ABOUT DEBIAN

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.
	      Please notice this option isn't related to the terminal length as in a "80 culums terminal".

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do right to left (RTL) layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter and A4. Default is A4.

       Postscript points
	      Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch.

       --bottom-margin=bm
	      Set bottom margin. Default is 36 postscript points.

       --top-margin=tm
	      Set top margin. Default is 36 postscript points.

       --left-margin=lm
	      Set left margin. Default is 36 postscript points.

       --right-margin=rm
	      Set right margin. Default is 36 postscript points.

       --gutter-width=gw
	      Set gutter width. Default is 40 postscript points.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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