Help me please

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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] );
}
}
}

}

BMF

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since Mar 2003

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May 21st, 2003

Re: Help me please

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)
/*
+-----------------------------------------------------------------+
| Author: Lim Chong Liang, Andrew                                 |
| Filename: comment.cpp                                           |
| Description: This program takes a C source file, and copies the |
|              text into a new .txt file, with all the comments   |
|              removed. The program only removes C-style          |
|              comments and by default copies itself.             |
| Copyright: Lim Chong Liang, Andrew, 2003                        |
| Website: http://www.abdn.ac.uk/~u02cll2/                        |
| Email: demandred90@hotmail.com OR u02cll2@abdn.ac.uk            |
+-----------------------------------------------------------------+
*/
 
 
#include <stdio.h>
#include <stdlib.h>
 
void copyFileWithoutComments(char[], char[]) ;
 
/*
 * The main function.
 */
int main(int argc, char *argv[])
{
  char fileToRead[]  = "comment.c" ;
  char fileToWrite[] = "comment.txt" ;
  copyFileWithoutComments(fileToRead,fileToWrite) ;
  printf("'%s' has been copied to '%s', with all C-style comments removed.\n", 
         fileToRead, fileToWrite) ;
  system("PAUSE");	
  return 0;
}
 
/*
 * Copies a C source file to a new text file, with all C-style comments removed.
 * fileToRead  - The name of the C source file.
 * fileToWrite - The name of the new text file.
 */
void copyFileWithoutComments(char fileToRead[], char fileToWrite[]) 
{
  FILE * fRead ;
  FILE * fWrite ;
 
  /* buffer for a line */
  char lineBuffer[256] ;
 
  /* open file for reading */
  fRead = fopen(fileToRead,"r");
 
  /* stop reading if file pointer is NULL */
  if (fRead == NULL)
  {
    printf("Could not open file for reading.") ;
    return ;
  }
 
  /* open file for writing */
  fWrite = fopen(fileToWrite,"w") ;
  if (fWrite == NULL)
  {
    printf("Could not create file for writing.") ;
    return ;
  }
 
  /* holds character read */
  char next ;
 
  /* to check if currently in a comment */
  int inComment = 0 ;
 
  /* keep reading until end of file */
  while ( (next = fgetc(fRead)) != EOF )
  {
    /* We are NOT within a comment. */
    if ( !inComment )
    {
      if ( next == '/' ) {
        char temp = fgetc(fRead) ;
        if ( temp == '*' )
          inComment = 1 ;
        else  {
          fputc(next,fWrite) ;
          fputc(temp,fWrite) ;
        }
      }
      else
        fputc(next,fWrite) ;
    }
    /* We are in a comment. */
    else
    {
      if ( next == '*' )  {
        char temp = fgetc(fRead) ;
        if ( temp == '/' )
          inComment = 0 ;
      }
    }
  }
 
  /* close files */
  fclose(fWrite) ;
  fclose(fRead) ;
}
/*
+-----------------------------------------------------------------+
| Author: Lim Chong Liang, Andrew                                 |
| Filename: comment.cpp                                           |
| Description: This program takes a C source file, and copies the |
|              text into a new .txt file, with all the comments   |
|              removed. The program only removes C-style          |
|              comments and by default copies itself.             |
| Copyright: Lim Chong Liang, Andrew, 2003                        |
| Website: http://www.abdn.ac.uk/~u02cll2/                        |
| Email: demandred90@hotmail.com OR u02cll2@abdn.ac.uk            |
+-----------------------------------------------------------------+
*/


#include <stdio.h>
#include <stdlib.h>

void copyFileWithoutComments(char[], char[]) ;

/*
 * The main function.
 */
int main(int argc, char *argv[])
{
  char fileToRead[]  = "comment.c" ;
  char fileToWrite[] = "comment.txt" ;
  copyFileWithoutComments(fileToRead,fileToWrite) ;
  printf("'%s' has been copied to '%s', with all C-style comments removed.\n", 
         fileToRead, fileToWrite) ;
  system("PAUSE");	
  return 0;
}

/*
 * Copies a C source file to a new text file, with all C-style comments removed.
 * fileToRead  - The name of the C source file.
 * fileToWrite - The name of the new text file.
 */
void copyFileWithoutComments(char fileToRead[], char fileToWrite[]) 
{
  FILE * fRead ;
  FILE * fWrite ;

  /* buffer for a line */
  char lineBuffer[256] ;

  /* open file for reading */
  fRead = fopen(fileToRead,"r");
  
  /* stop reading if file pointer is NULL */
  if (fRead == NULL)
  {
    printf("Could not open file for reading.") ;
    return ;
  }
  
  /* open file for writing */
  fWrite = fopen(fileToWrite,"w") ;
  if (fWrite == NULL)
  {
    printf("Could not create file for writing.") ;
    return ;
  }
    
  /* holds character read */
  char next ;

  /* to check if currently in a comment */
  int inComment = 0 ;

  /* keep reading until end of file */
  while ( (next = fgetc(fRead)) != EOF )
  {
    /* We are NOT within a comment. */
    if ( !inComment )
    {
      if ( next == '/' ) {
        char temp = fgetc(fRead) ;
        if ( temp == '*' )
          inComment = 1 ;
        else  {
          fputc(next,fWrite) ;
          fputc(temp,fWrite) ;
        }
      }
      else
        fputc(next,fWrite) ;
    }
    /* We are in a comment. */
    else
    {
      if ( next == '*' )  {
        char temp = fgetc(fRead) ;
        if ( temp == '/' )
          inComment = 0 ;
      }
    }
  }
  
  /* close files */
  fclose(fWrite) ;
  fclose(fRead) ;
}

Dante Shamest

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since Apr 2003

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May 22nd, 2003

Re: Help me please

Thaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaanks alot...

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

THANX

BMF

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since Mar 2003

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