Help with C programming.

Hey guys, I just started learning C after I finished reading the book " Learn Python the hard way". I've been following tutorials from cprogramming.com but some examples are giving me errors on xcode. I'm unfamiliar with xcode as I used VIM for python. My question is, how do I compile code on xcode but run it on terminal? I tried dragging and dropping the product onto the terminal but it doesn't run. Also, does anyone know a good tutorial for OOP? I need to familiarize myself with it more. For example, this program from cprogramming.com does not give an output when ran on Xcode:

Code:

#include <stdio.h>

struct xampl {
  int x;
};

int main()
{  
    struct xampl structure;
    struct xampl *ptr;

    structure.x = 12;
    ptr = &structure; /* Yes, you need the & when dealing with 
                           structures and using pointers to them*/
    printf( "%d\n", ptr->x );  /* The -> acts somewhat like the * when 
                                   does when it is used with pointers
                                    It says, get whatever is at that memory
                                   address Not "get what that memory address
                                   is"*/
    getchar();
}