title: Why is char* t not point to NULL defined before ctime_r?
body: <p>Before I use <code>ctime_r</code>,I defined <code>char* t</code> instead of <code>char* buf[32]</code> by mistake.I thought <code>char* t</code> is point to NULL,and there will be a error after using <code>ctime_r</code>,like <code>stycpy(t,"hello");</code>.But I was surprised to find that <code>char* t</code> is not point to NULL as usual.Why?</p>