/* p13.c */

/* this program demonstrates some of the characteristics */
/* of variable scoping in C.                             */

/* The scope of y and z include all lines that follow their  */
/* definitions.  Thus z may be used in function f1 and f2    */
/* but y may be used only in f2                              */

int z = 12;

int f1(
int x)
{
   x = x + y + z;
   return(x);
}

int y = 11;

int f2(
int x)
{
   x = x + y + z;

}