s1.c
====

#include <stdio.h>

/* Illustrates the features of the storage class static
     gcc -ansi s*.c -o s	=> s1.o, s2.o, s          */

static int a = 4;  /* global variable but local to this file */

void f1(void)
{
  static int b = 6;

  ++a;
  ++b;
  printf("From f1: a = %d  b = %d\n", a, b);
}

main()
{
  extern int b;

  f1();
  f1();
  printf("From main-1:  a = %d  b = %d\n", a, b);
  f2();
  f2();
  ++b;
  printf("From main-2:  a = %d  b = %d\n", a, b);
}

Output:
=======
From f1: a = 5  b = 7
From f1: a = 6  b = 8
From main-1:  a = 6  b = 48
From f2:  a = 29  b = 17  c = 75
From f2:  a = 30  b = 18  c = 75
From main-2:  a = 6  b = 49

s2.c
====

#include <stdio.h>

static int a = 28;  /* global variable but local to this file */
int b = 48; /* global */

void f2(void)
{
  static int b = 16;
  register int c = 75;

  ++a;
  ++b;
  printf("From f2:  a = %d  b = %d  c = %d\n", a, b, c);
}