/* constant.h -- defines some global constants */
static const double PI = 3.14159;
static const char * MONTHS[12] =
 {"January", "February", "March", "April", "May", "June", "July",
 "August", "September", "October", "November", "December"};
/* file1.c -- use global constants defined elsewhere */
#include "constant.h"
/* file2.c -- use global constants defined elsewhere */
#include "constant.h"