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why I got this answer?

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Hi all.
  I write a small program. But I can't understand the result of it. here is my code:
-----------------------------------------
#include <stdio.h>

int* foo(int n)
{
    int *p = &n;
    return p;
}

int f(int m)
{
    int n = 1;
    return 999;
}

int main(int argc, char *argv[])
{
	int num = 1;
	int *p = foo(num);
	int q = f(999);
	printf("[%d]\n[%d]\n", *p, q);
}
-----------------------------------------
output:
[999]
[999]
Why *p is 999?
Then I changed my code:
-----------------------------------------
#include <stdio.h>

int* foo(int n)
{
    int *p = &n;
    return p;
}

int f()
{
    int n = 1;
    return 999;
}

int main(int argc, char *argv[])
{
	int num = 1;
	int *p = foo(num);
	int q = f();
	printf("[%d]\n[%d]\n", *p, q);
}
------------------------------------
output:
[1]
[999]
Why *p is 1? I can't understand why.

--
Thanks,
Madper Xie.
-- 
comp.lang.c.moderated - moderation address: clcm@plethora.net -- you must
have an appropriate newsgroups line in your header for your mail to be seen,
or the newsgroup name in square brackets in the subject line.  Sorry.

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why I got this answer? 谢成骏 <bbboson@gmail.com> - 2013-02-26 10:51 -0600
  Re: why I got this answer? Jasen Betts <jasen@xnet.co.nz> - 2013-03-11 18:25 -0500
  Re: why I got this answer? Barry Schwarz <schwarzb@dqel.com> - 2013-03-11 18:25 -0500
  Re: why I got this answer? Thomas Richter <thor@math.tu-berlin.de> - 2013-03-11 18:25 -0500

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