free()
Brian K. W. Hook
jdb at reef.cis.ufl.edu
Fri Dec 14 01:04:38 AEST 1990
Okay, I know this is going to be a stupid question to a lot of you, but I
am just a tad curious. According to the C-reference manuals, you pass
free a pointer to a block of memory that you want deallocate. Eg.
char *a;
a=malloc(80);
if (a) free(a);
Now what happens if, oh, you do THIS:
foo()
{
int x;
x=10;
if (x) free (&x);
}
I know that malloc uses heap space and that the local variables take up the
stack, so what happens? &x is NOT null so it will try to free it, so what
happens? Also, in a similar vein, are global variables allocated on the heap
or stack? All replies would be appreciated.
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