/*
 * static_local.c
 *
 * Looking at the 'static' keyword
 * in C as it applies to local variables
 * in funcions.
 *
 */

#include <stdio.h>

void f1(){
  int a;
  a += 1;
  printf("in f1 : a = %i \n", a);
}
void f2(int init){
  // init is a boolean 1=>init, 0=>'normal call'
  static int a;
  if (init){
    a = 0;
  }
  else {
    a += 1;
    printf("in f2 : a = %i \n", a);
  }
}

// THIS IS BAD!!!
// ... but the idea is that we're trying
// to return a pointer to an int which is 3.
// The problem is that once the function exits,
// the 'value' variable is effectively gone.
// So using it's (old) address outside the 
// the function would be a mistake.
int* three(){
  int value = 3;
  return &value;
}

int main(){
  int i;

  for (i=0; i<5; i++){
    f1();
  }

  f2(1);      // initialize a
  for (i=0; i<5; i++){
    f2(0);    // call it normally
  }

  return 0;
}