/* --------------------------------------------------------------------- 
**  Figure 12.5:  Pointer operations. 
** --------------------------------------------------------------------- 
*/
#include <stdio.h>

void main( void )
{
    int * pt = NULL;    /* An int pointer variable, initialized to NULL. */ 
    int * p;            /* A pointer variable that can point at any int. */ 
    int   k = 17;       /* An integer variable initialized to 17.   */      
    int   m;       

    p = &k;             /* Use & to set a pointer to k's memory location.  */ 
    pt = p;             /* Copy a pointer. */ 
    m = *p + 2;         /* Add 2 to the value of p's referent; store result in m. */  
    *p = m;             /* Copy the value of m into p's referent. */    

    printf( "address of  p: %i  contents of  p: %i\n", (int)&p, (int)p );
    printf( "address of pt: %i  contents of pt: %i\n", (int)&pt, (int)pt );
    printf( "address of  k: %i  contents of  k: %i\n", (int)&k, k );
    printf( "address of  m: %i  contents of  m: %i\n", (int)&m, m );
}