RE: [SLUG] GCC question

[Amir Binyamini]

Hi,
The reason is that you are trying to incremnt a string
and not a char; and the incremetn operation is not allowed.
If you will try to run a simple 2 line program like the following,
you will get a segmentation fault:
     char* test = "ab";
     (*test)++;
because *test is a string;
aslo If you'll try something a little similiar :
      char myTest[] = "ab";
       myTest++;
you'll get a compilation problem (in gcc)
  ("wrong type argument to increment")
It could be that the borelnad environment is less
strict so it does not crash ; BTW - what does it print when running
in borland?
I assume what you meant to do , which works OK with gcc on linux , is:
void    code(char *);
main()
     {
     code("This is a test string");
     putchar('\n');
     return 0;
     }
void code (char * strptr)
   {
   while( *strptr)
       {
       printf("%c", *strptr);
       ++strptr;
       }
   }
Regards,
Amir
From: David Bowskill <[EMAIL PROTECTED]>
To: slug@slug.org.au
Subject: [SLUG] GCC question
Date: Sun, 18 Apr 2004 20:58:56 +1000
HI SLUGgers,
   I have this little problem with GCC which I wonder if anyone can 
enlighten me on.  The little program below has been run on three different 
machines all with the same result. The program compiles OK  under GCC but 
fails with a segmentation error.  Under Borland 'C for DOS', it compiles 
and runs correctly.

Thanks in anticipation
David
/*
Program to increment the chars in a string
and print to screen.  Works OK with Borland
'C for DOS' but fails with GCC 3.3
(segmentation error) -why????
*/
 #include <stdio.h>
 void    code(char *);
   main()
   { code("This is a test string");
     putchar('\n');
     return 0;
   }
/*
(*strptr)++ gets then increments the CHARACTER,
while *strptr++ gets the CHARACTER then
increments the POINTER
*/
   void code (char * strptr)
  {          while( *strptr)
       { (*strptr)++ ;     //This line fails in GCC
       //(*strptr) = (*strptr) + 1 ;// so does this
         printf("%c", *strptr++);
       }
  }
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