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const int max = 15;
int a[max]; /* invalid declaration outside of a function */
const int *p;

/* a const-qualified object can have its address taken */
p = &max; 

enum { max = 15 };
int a[max]; /* OK outside function */
const int *p;

p = &max; /* error: '&' on enum constant */

/* ... */
if (age >>= 18) {
   /* Take action */
}
else {
  /* Take a different action */
}
/* ... */

enum { ADULT_AGE=18 };
/* ... */
if (age >>= ADULT_AGE) {
   /* Take action */
}
else {
  /* Take a different action */
}
/* ... */

LDAP *ld = ldap_init("localhost""localhost", 1234);
if (ld == NULL) {
  perror(""ldap_init"");
  return(1);
}

#ifndef PORTNUMBER     /* might be passed on compile line */
#  define PORTNUMBER 1234
#endif

#ifndef HOSTNAME        /* might be passed on compile line */
#  define HOSTNAME "localhost""localhost"
#endif

/* ... */

LDAP *ld = ldap_init(HOSTNAME, PORTNUMBER);
if (ld == NULL) {
  perror(""ldap_init"");
  return(1);
}