pointer & struct

[SAVAGE CHARLES L]

In article <7208 at pyr.gatech.EDU> dvu at pyr.gatech.EDU (Dinh Vu) writes:
>The small program below compiled fine, but
>it gave core dump when I run it.  Would someone give me 
>some light on this matter.
>
>	 #include <stdio.h>
>	
>	struct abc {
>		int x;
>		int y;
>	};
>
>	main()
>	{
>		struct abc *var;
--------------->var = (abc *) malloc ((unsigned) sizeof(struct abc));
>		var->x = 5;
>		var->y = 10;
>	}
>
Sombody has probably already fixed this error, but you must alocate
memory for the pointer to point too.  If not, all the pointer has is a 
random address, and when you assign a value to the pointer it overwrites
some memory in storage that may be used by your source code or may not be
yours at all.

Savage.





	
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