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Full Discussion: why I am gettin a segmentation fault when using pointers
Top Forums Programming why I am gettin a segmentation fault when using pointers Post 302166838 by user_prady on Wednesday 13th of February 2008 01:01:09 AM
Old 02-13-2008
New problem using pointer in structure
Quote:
Originally Posted by Franklin52
You must assign the address of the variable to the pointer this way:

Code:
input_re_see = &input_re;

instead of:

Code:
*input_re_see = input_re;

Google on "pointers tutorial".

Regards
You are right ,,Now I am getting , but the problem again comes when I am trying to use a structure..
I am doing the following

Code:
typedef unsigned int U;
typedef struct {U c; U d;} vec32;
 
FILE* fileopen();
void read_line(FILE *);
 
void read_line(FILE *fh){
  char s[100];
  double input_re, input_im, *input_re_tmp, *input_im_tmp;
  U lsts, vgagain;
  U *lsts_tmp, *vgagain_tmp;
  
//vec32 *lsts_str, *vgagain_str;

   if( fgets(s,sizeof(s),fh) != NULL) {
     sscanf(s,"%lf %lf %u %u \n",&input_re, &input_im, &lsts, &vgagain);

     input_re_tmp   = &input_re;
     input_im_tmp   = &input_im;
     lsts_tmp          = &lsts;
     vgagain_tmp     =&vgagain_tmp;

    //   lsts_str->d     = &lsts;
    //   vgagain_str->d    = &vgagain;
    
 
     printf(" %f %f %u %u \n  ", *input_re_tmp, *input_im_tmp, *lsts_tmp, *vgagain_tmp);
     //printf(" %f %f %u %u %u %u %u %u \n  ", *input_re_tmp, *input_im_tmp, lsts_str->d, vgagain_str->d);
 
    }
}
FILE* fileopen(){
          void *file = fopen("abc.txt", "r");
            return file;
}
int main(void) {
 
           FILE *fh;
           int i;
              fh = fileopen();
              for(i =0;i < 5 ; i++){
                 read_line(fh);
              }
 
              return 0;
}

My Input file (abc.txt) is as follows
Code:
 5.08107 14.1132 0 71 
 -0.941856 14.9704 0 71 
 -6.80986 13.3651 0 71

Why I am getting a segmentation fault when I removing the commented lines.. Please I am elementary to pointer to structure , so If I am making some mistakes Please suggest me ..

Thanks in advance...

Regards,
Prady
 

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LEARN ABOUT DEBIAN

tv_sort

TV_SORT(1p)						User Contributed Perl Documentation					       TV_SORT(1p)

NAME

       tv_sort - Sort XMLTV listings files by date, and add stop times.

SYNOPSIS

       tv_sort [--help] [--by-channel] [--output FILE] [FILE...]

DESCRIPTION

       Read XMLTV data and write out the same data sorted in date order.  Where stop times of programmes are missing, guess them from the start
       time of the next programme on the same channel. For the last programme of a channel, no stop time can be added.

       Tv_sort also performs some sanity checks such as making sure no two programmes on the same channel overlap.

       --output FILE write to FILE rather than standard output

       --by-channel sort first by channel id, then by date within each
		       channel.

       --duplicate-error If the input contains the same programme more than once,
			    consider this as an error. Default is to silently
			    ignore duplicate entries.

       The time sorting is by start time, then by stop time.  Without --by-channel, if start times and stop times are equal then two programmes
       are sorted by internal channel id.  With --by-channel, channel id is compared first and then times.

       You can think of tv_sort as converting XMLTV data into a canonical form, useful for diffing two files.

EXAMPLES

       At a typical Unix shell or Windows command prompt:

       tv_sort <in.xml >out.xml
       tv_sort in.xml --output out.xml

       These are different ways of saying the same thing.

AUTHOR

       Ed Avis, ed@membled.com

perl v5.14.2							    2006-03-02							       TV_SORT(1p)
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