Thread: structure info

When you make a structure

Code:

struct info{
     int x;
     char *string[];
};

then do

Code:

struct info new=NULL;
struct info *ptr;
ptr=&given;

what is *string[]'s value and what would an int's and double's and so forth be? I tried with this

Code:

printf("The sting is NULL when on the next line\n...%s...",new->name);  /*new->name is a one dimensional array here*/

and I got a seg fault. I am pretty sure an int would be 0 a float would be 0.0f and a double 0.0, I think a string is '\0'. If I am wrong correct me please. I have no clue on a n-dimension array though thanx

new is a keyword, so you shouldn't give that name to an object.

I'm not sure what you're asking, but if you're trying to print a c-string without initializing it (giving it a value) you might end up with segfaults.

I'm confused by what you're asking
new is pointing at NULL, so that's obvious why its segfaulting

floats, doubles?
Where are they in your code

you print new->name, but there is no name

char *strings[] isn't a 2D array

I was thinking about doing something. A little experiment. I was wondering what happens when you declare a structure as NULL do all the elements become there equivalent of NULL or do they not exist until you allocate memory for them.

char *strings[] isn't a 2D array

Then what do I use to hold an array of strings when malloced?

you print new->name, but there is no name

I had that from something I wrote I am sorry name could be any string.

sorry for the confusion

When you create an instance of a structre, all members exist. It doesn't matter what you initialize them to, they exist simply because you've created an instance of it. It's lke doing:

Code:

int x = 0;

x exists, what you initialize it to makes no difference, because x already has been created. In the case of a structure, all members exist. Therefore, you're allowed to do whatever you normally could with them. They've all simply (potentially) been set to zero. The string (array) exists, it just potentially holds nothing.

On an aside, your initial example is just wrong, becaue you haven't made a string. You've attempted to make an array of pointers to characters, but you haven't specified any size for the array.

So in short, if you're attempting to get an answer, try to at least make your code as legal or compilable as possible, otherwise giving "what if" answers doesn't really do any good if all your code is wrong.

Quzah.