/* File: static.c
 * 
 * This program demonstrates the use of 
 * static variables.
 */

#include<stdio.h>

int add_one(int) ;

int add_one(int a) {
  static int permanent ;

  if (a == 0) 
     permanent = 0 ;
  else
     permanent++ ;

  return(permanent) ;
}

main() {
  int i ;

  i = add_one(0) ;
  while (i < 10) {
    i = add_one(13) ;
    printf("i = %d\n", i) ;
  }
}
-------------------------------
i = 1
i = 2
i = 3
i = 4
i = 5
i = 6
i = 7
i = 8
i = 9
i = 10