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Join Date: Mar 2003
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Help me please

 
0
  #1
May 20th, 2003
Hello>>>

How are you all?
I need a quick help with my assignment... it is in C not in C++... So, Could you help me?
I don't know what to do!!


the question is:
Write a program that reads a data file containing a C program and writes it to another file removing all comments.

the rubbish answer that i made :

#include <stdio.h>
#include <string.h>

void main ()
{
FILE *ptr;
FILE *ptr2;
char *com = { "*/" };
char str[500], str2[500];

if( ( ptr = fopen( "program.dat", "w" ) ) == NULL )
printf( "\n Failed to open the file" );
else
{
printf( "\nEnter a C program:" );
fprintf( ptr, "%s", str );
}

strcpy( str2, str );

if( ( ptr = fopen( "program.dat", "r" ) ) == NULL )
printf( "\n Failed to open the file" );

else
{
while( !feof( ptr ) )
{
for( int i=0; str[i]!= NULL; i++ )
if( ( ptr2 = fopen( "newfile.dat", "w+" ) ) == NULL )
printf( "\n Failed to open the file" );

else
{
if( str[i]=='/' && str[i+1]=='*' )
{
com = strstr( str, com );
while( com != NULL )
{
com = strstr( com+1, str );
}
}

else
fprintf( ptr2, "%c", str2[i] );
}
}
}

}
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0
  #2
May 21st, 2003
I found this problem of yours harder than expected. Firstly, I'm better at C++ libraries than the C libraries. So I had to revise all my C File I/O. Secondly, I hate parsing. Anyway here's my solution to your problem.

My technique isn't perfect.

It removes all C-style comments. (/* */) but if it encounters the comments in a string (which is rare in real practical life), it will ignore anything between them in the string.

Plus, I have little experience in parsing text files, so the way I did it may seem messy.

I have posted the code below. The code in HTML format can be viewed here if you prefer syntax highlighting.

C++ Syntax (Toggle Plain Text) 
  1. /*
  2. +-----------------------------------------------------------------+
  3. | Author: Lim Chong Liang, Andrew                                 |
  4. | Filename: comment.cpp                                           |
  5. | Description: This program takes a C source file, and copies the |
  6. |              text into a new .txt file, with all the comments   |
  7. |              removed. The program only removes C-style          |
  8. |              comments and by default copies itself.             |
  9. | Copyright: Lim Chong Liang, Andrew, 2003                        |
  10. | Website: http://www.abdn.ac.uk/~u02cll2/                        |
  11. | Email: demandred90@hotmail.com OR u02cll2@abdn.ac.uk            |
  12. +-----------------------------------------------------------------+
  13. */
  14.  
  15.  
  16. #include <stdio.h>
  17. #include <stdlib.h>
  18.  
  19. void copyFileWithoutComments(char[], char[]) ;
  20.  
  21. /*
  22.  * The main function.
  23.  */
  24. int main(int argc, char *argv[])
  25. {
  26.   char fileToRead[]  = "comment.c" ;
  27.   char fileToWrite[] = "comment.txt" ;
  28.   copyFileWithoutComments(fileToRead,fileToWrite) ;
  29.   printf("'%s' has been copied to '%s', with all C-style comments removed.\n", 
  30.          fileToRead, fileToWrite) ;
  31.   system("PAUSE");	
  32.   return 0;
  33. }
  34.  
  35. /*
  36.  * Copies a C source file to a new text file, with all C-style comments removed.
  37.  * fileToRead  - The name of the C source file.
  38.  * fileToWrite - The name of the new text file.
  39.  */
  40. void copyFileWithoutComments(char fileToRead[], char fileToWrite[]) 
  41. {
  42.   FILE * fRead ;
  43.   FILE * fWrite ;
  44.  
  45.   /* buffer for a line */
  46.   char lineBuffer[256] ;
  47.  
  48.   /* open file for reading */
  49.   fRead = fopen(fileToRead,"r");
  50.  
  51.   /* stop reading if file pointer is NULL */
  52.   if (fRead == NULL)
  53.   {
  54.     printf("Could not open file for reading.") ;
  55.     return ;
  56.   }
  57.  
  58.   /* open file for writing */
  59.   fWrite = fopen(fileToWrite,"w") ;
  60.   if (fWrite == NULL)
  61.   {
  62.     printf("Could not create file for writing.") ;
  63.     return ;
  64.   }
  65.  
  66.   /* holds character read */
  67.   char next ;
  68.  
  69.   /* to check if currently in a comment */
  70.   int inComment = 0 ;
  71.  
  72.   /* keep reading until end of file */
  73.   while ( (next = fgetc(fRead)) != EOF )
  74.   {
  75.     /* We are NOT within a comment. */
  76.     if ( !inComment )
  77.     {
  78.       if ( next == '/' ) {
  79.         char temp = fgetc(fRead) ;
  80.         if ( temp == '*' )
  81.           inComment = 1 ;
  82.         else  {
  83.           fputc(next,fWrite) ;
  84.           fputc(temp,fWrite) ;
  85.         }
  86.       }
  87.       else
  88.         fputc(next,fWrite) ;
  89.     }
  90.     /* We are in a comment. */
  91.     else
  92.     {
  93.       if ( next == '*' )  {
  94.         char temp = fgetc(fRead) ;
  95.         if ( temp == '/' )
  96.           inComment = 0 ;
  97.       }
  98.     }
  99.   }
  100.  
  101.   /* close files */
  102.   fclose(fWrite) ;
  103.   fclose(fRead) ;
  104. }
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0
  #3
May 22nd, 2003
Thaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaanks alot...

I don't know how can I reward you?????

THANX
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