/*********
 * test.c
 *
 * testing foo->bar++ syntax ...
 * and also giving a tiny "object-oriented-like coding in C" example
 *
 *   $ gcc test.c -o test
 *   $ ./test
 *    f->bar is 2
 *
 **********/

#include <stdio.h>
#include <stdlib.h>

typedef struct _foo *foo;    // foo is a pointer to (struct _foo)
struct _foo {                // a (struct _foo) has a .bar property
  int bar;
};

// allocate space for a (struct _foo) and return a pointer to it.
foo new_foo(){               
  foo f = malloc(sizeof(struct _foo));
  f->bar = 0;        // equivalent code :   (*f).bar=0
  return f;
}

int main(){
  foo f = new_foo();  // make one
  f->bar++;           // increment f->bar to 1  (this syntax is OK)
  (f->bar)++;         // increments again to 2  (this syntax is also OK)
  printf(" f->bar is %d \n", f->bar);             // prints "is 2"
  return 0;
}