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enum { max = 15 };
int i = /* Initialize to user -supplied value */;

if ( (i >= 0) && ( (i++) <= max) ) {
  /* Code */
}

char *p = /* Initialize,; may or may not be NULL */

if (p || (p = (char *) malloc(BUF_SIZE)) ) {
  /* Perform some Docomputation stuffbased withon p */
  free(p);
  p = NULL;
}
 else {
  /* Handle malloc() error */
  return;
}

char *p = /* Initialize; may or may not be NULL */
char *q = NULL;
if (p == NULL) {
  q = (char *) malloc(BUF_SIZE);
  p = q;
}
if (p == NULL) {
  /* Handle malloc() error */
  return;
}

/* Do stuff withPerform some computation based on p */
free(q);
q = NULL;