/* A Test of Lexical Scoping */
#include <stdio.h>

/* Global variables */
int a = 1, b = 2, c = 3, d = 4 ;

void f(int b) {
   int c = 103 ;

   printf("\n    f: ") ;
   printf("a = %4d, b = %4d, c = %4d, d = %4d\n", 
      a, b, c, d) ;
   a = 201 ; b = 202 ; c = 203 ; d = 204 ;
}

main() {
   int a = 11, b = 12 ;

   printf("\n main: ") ; 
   printf("a = %4d, b = %4d, c = %4d, d = %4d\n", 
      a, b, c, d) ;

   f(b) ;

   printf("\n main: ") ; 
   printf("a = %4d, b = %4d, c = %4d, d = %4d\n", 
      a, b, c, d) ;

   printf("\n") ;
}
-------------------------------------------------

 main: a =   11, b =   12, c =    3, d =    4

    f: a =    1, b =   12, c =  103, d =    4

 main: a =   11, b =   12, c =    3, d =  204