Structture problem

This is a discussion on Structture problem within the C Programming forums, part of the General Programming Boards category; I have a problem with this function. My program crashes when I try make my structure "f_table[x].table.u_value" point to my ...

  1. #1
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    Structture problem

    I have a problem with this function. My program crashes when I try make my structure "f_table[x].table.u_value" point to my array of pointers.... Is this the correct way of making the assignement?
    At the beginnig of the function I make my structure point to the first element of my array of pointers "f_table[0].table.u_id=a_p_ibuf[0];".

    Code:
    nt fill_inc_struct(char *a_p_ibuf[], FTABLE *f_table, int total)
    {
    	int 		i=0, x=0;
    
    	f_table[0].table.u_id=a_p_ibuf[0];
    	
    	for (i=0; i<total; i++)
    	{
    		printf(" Before assignment   %s\n",a_p_ibuf[i] );
    		f_table[x].table.u_value=(int*)(a_p_ibuf+i);
    		x++;
    		i++;
    		printf(" TABLE %s \n", *(f_table[x].table.u_id));
    	}
    	return 1;
    }
    Many thanks.

  2. #2
    and the hat of wrongness Salem's Avatar
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    Without a clear idea of what the underlying structure is, it could be anything.

    Why the * here?
    printf(" TABLE &#37;s \n", *(f_table[x].table.u_id));

    If you're using gcc, then
    gcc -W -Wall -ansi -pedantic prog.c
    will tell you a lot about your code.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    The structure is like this
    Code:
    typedef struct incl_table{
    		char	*t_flag;
    	union final_table{
    			char	*u_id;
    			int		*u_value;
    	}table;
    }FTABLE;
    Here "printf(" TABLE &#37;s \n", *(f_table[x].table.u_id));" I am trying to print the value the pointer is pointing to. But my problem is not there it is when i try to make my structure point to my array of pointers: "f_table[x].table.u_value=(int*)(a_p_ibuf+i);"
    Thanks..

  4. #4
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    To be honest, I don't really understand the reason for having an "int *" and "char *" in a union - it makes very little sense to unionize two pointers that way - unless you are trying to avoid a cast, but if that's the goal, I think a cast is actually MORE readable.

    --
    Mats

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