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Why are you trying to use those macros. What is your purpose...
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Why are you trying to use those macros. What is your purpose...

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arut - <br />
<br />
marconovaro is right, it is double-underscore for each. &nbsp;He should get the points...<br />
<br />
rajeev - <br />
<br />
those macros give the source code filename and the source code line number. &nbsp;They are ANSI predefined macros and are commonly used to report errors/status when you can't run in a debugger.<br />
<br />

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arut -

marconovaro is right, it is double-underscore for each.  He should get the points...

rajeev -

those macros give the source code filename and the source code line number.  They are ANSI predefined macros and are commonly used to report errors/status when you can't run in a debugger.



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i also support macronovaro.. and <br />
just to add to your knowledge ..( pardon me if u already know this)..<br />
__FUNCTION__ gives u function name<br />

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i also support macronovaro.. and
just to add to your knowledge ..( pardon me if u already know this)..
__FUNCTION__ gives u function name


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<div class="content wysiwyg-content">
I was trying to compile the following program:<br />
<br />
#include &lt;stdio.h&gt;<br />
<br />
main()<br />
{<br />
<br />
printf(&quot;\n This print is from line %d of file %s&quot;,_LINE_,_FILE_);<br />
<br />
}<br />
<br />
I do gcc test.c (name of the program file) and the compiler says that _LINE_ and _FILE_ are undeclared.<br />
<br />
Is there a way to make this work or is this compiler dependent?<br />
<br />
Regards,<br />
Arut
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</div>


I was trying to compile the following program:

#include <stdio.h>

main()
{

printf("\n This print is from line %d of file %s",_LINE_,_FILE_);

}

I do gcc test.c (name of the program file) and the compiler says that _LINE_ and _FILE_ are undeclared.

Is there a way to make this work or is this compiler dependent?

Regards,
Arut

Using _LINE_ and _FILE_ macros

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.