Please clear my doubt

From: Yang Lee (yang__lee_at_ausi.com)
Date: 11/30/03 

Date: Sun, 30 Nov 2003 08:55:00 +0000 (UTC)

Hi All,
I have two char pointers

char *a,*b;
a=(char *)malloc(10);
b=a; /*******/

so both pointers are looking at same mamory location

strcpy(a,"gates");
printf("%s",b);

Now I free pointer b;
free(b);

Then will pointer a be in existance or it will be also freed.
or if I free pointer a then will b point to same location.

Also

a=(char *)malloc(10);
strcpy(a,"gates");
free(a);
printf("%s",a); this still prints "gates " why is this happening
even after freeing the memory? should I write
a=NULL;

Please help my simple querries as it will help me a lot.

regards Lee 

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