• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 333
  • Last Modified:

count total of comment lines in the file

Which command Can i use to count total of comment lines in the C code file.
the comment line pattern is /*hahfhahhasdhk*/

thanks
0
rongz
Asked:
rongz
  • 8
  • 5
  • 3
  • +1
1 Solution
 
ozoCommented:
is
/*hahfhahhasdhk*/ printf("/*hahfhahhasdhk*/"); /*hahfhahhasdhk*/ one or two comment lines?

How about
/*hahfhahhasdhk
  hahfhahhasdhk
  hahfhahhasdhk
  hahfhahhasdhk*/
?
0
 
hajekCommented:
awk '   BEGIN { COUNT=0 }
     /\/\*/,/\*\// { COUNT++ }
    END { print COUNT }
    ' _the_file_

this gives you total number of lines where comments occur (including:
{
   call_xxx();   /* comment */
}
or
/* comment
comment
 end comment */

0
 
ozoCommented:
main(){ /* How many comment lines in this program? */ /*
hahfhahhasdhk
hahfhahhasdhk
hahfhahhasdhk
hahfhahhasdhk
*/
printf("\"/*hahfhahhasdhk*/\\");
}
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
rongzAuthor Commented:
I just tried hajek's solution. It failed. the output is total of lines in the file. In fact I want to know the total of code lines and total of comment lines in a C-coded file.



0
 
ozoCommented:
Ok, what's a code line?
0
 
rongzAuthor Commented:
I just tried hajek's solution. It failed. the output is total of lines in the file. In fact I want to know the total of code lines and total of comment lines in a C-coded file.



0
 
hajekCommented:
Maybe my solution does not do what you want, but it does NOT return total number of lines - I suppose you do not have comments on every line, do you ??

What EXACTLY you want ?

PS: when file is:
--------------------------------
{
      call_xxx();   /* comment */
}
/* comment
comment
comment */
--------------------------------
it returns 4, there are only 2 lines (of 6), which does not include kinda comment.


0
 
rongzAuthor Commented:
code line is all the lines except comment lines
0
 
ozoCommented:
So is
 call_xxx();   /* comment */
a code line or a comment line?

BTW, I agree that hajek's solution doesn't work,
by any reasonable definition of comment line, unless you stick to  hajek's programming style,
but it also doesn't return total number of lines.
0
 
rongzAuthor Commented:
if file content is :
       
 call_xxx();   /* comment */


 Then      total of code line is 1
             total of  comment line is 1

0
 
hajekCommented:
ozo: hey, man, what don't you like on my programming style ???
Too quick for you ?

OK, just kidding. I know it can return greater number, than it should to, but if rongz wanted to count lines which begin with "/*" and end with "*/", he was to write it clearly.

0
 
ozoCommented:
so, is


a code line, if it's not a comment line?
is
   /* comment */;
a code line?
0
 
ozoCommented:
hajek, I didn't say I don't like your C programming style
(indeed, it makes comment counting easier than more pathological styles:-)
But if a comment counter is supposed to work on any C program,
I don't know if it can be counted on.
0
 
ahoffmannCommented:
as rongoz said at his comment (July 14 1998 - 04:50AM PDT):

x=y; /* comment */ y=x; /* comment */; x /* comment */ =y;

is one code line *and* one comment line,
so a simple solution is:

awk '{lines++} /\/\*/&&/\*\// {comment++} END { print "code="lines", comments="comment}' _the_file_

NOTE: it fails for netsted comments across multiple lines
and if there are lines containing both literals "/*"  *and*  "*/"  anyhow (for example as strings)
0
 
rongzAuthor Commented:
Sorry hajek. I just tried your solution again.It's perfect.
also thanks ahoffmann.
BTW, grep -c also can count the total of lines matching pattern. But how can I write the pattern. The following command doesn't work.

grep -c  /\/\*/,/\*\// _the_file_    
0
 
ahoffmannCommented:
grep -c '/\*.*\*/' _the_file
0
 
ozoCommented:
that counts
  printf("/*hahfhahhasdhk*/");
but not
/*
hahfhahhasdhk
*/
to count comments correctly requires something like

#!/usr/bin/perl
$/ = undef;
$_ = <>;
$c += !defined $2 while m#/\*[^*]*\*+([^/*][^*]*\*+)*/|("(\\.|[^"\\])*"|'(\\.\|[^'\\])*'|\n+|.[^/"'\\]*)#g;
print $c;
0
 
ahoffmannCommented:
ozo, I know that (see my comments). Would you like to see some more obfuscating code:

printf("/*"); /* comment*/ char */*comment*/str="*/";

real compilers have no problems with such things ;-)

BTW, could you please explain where to find &lt and &gt in perl (which perl version)?


0
 
ozoCommented:
The given perl script also has no problem with such things.

What do you mean by &lt and &gt ?
0

Featured Post

Receive 1:1 tech help

Solve your biggest tech problems alongside global tech experts with 1:1 help.

  • 8
  • 5
  • 3
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now