Example 1: An example with  complex language features.

typedef struct S {
    int *pi;
    int (*pf)();
}S;

void foo(S **pp)
{
    *pp = malloc(sizeof(S));
    (*pp)->pi = &i;
    (*pp)->pf = bar;
}

void  main( void)
{
    S *p;
    foo(&p);
    while(i < 10) 
        i = (*p->pf)(p) +1;
}