C / C++ / MFC

<br />
#include <iostream><br />
#include <string><br />
<br />
using namespace std;<br />
 <br />
//what does this: "void(Visit_) (int *s)" mean, it seems to me like<br />
//casting but the kind of casting I know is e.g: cout << (char)97;<br />
void PreOrder(void(Visit_) (int *s), int *s){<br />
     <br />
//This: "Visit_(s)" is very strange too. I have no idea what<br />
// "Visit_()" is, a variable, an identifer, a function ... etc<br />
   Visit_(s); <br />
}<br />
        <br />
static void Output_(int *t)<br />
  {cout << *t << 'Z';}  <br />
      <br />
           <br />
int main(){<br />
<br />
 <br />
int *p;<br />
int i=5;<br />
<br />
p=&i;<br />
<br />
 //This line is uncommon too, how is it possible to pass the name of <br />
 //a function as a parameter to a function. What are the actions taken <br />
 //in the background for this line<br />
 PreOrder(Output_, p);<br />
<br />
<br />
getchar();<br />
return 0;    <br />
}<br />