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| typedef int Datatype;
struct Node { Datatype data; struct Node *next; };
typedef struct link_stack { int size; struct Node *top; }linkStack;
linkStack *init_stack(void) { linkStack *s = malloc(sizeof(linkStack)); if(s != NULL) { s->size = 0; s->top = NULL; } return s; }
bool is_empty(linkStack *s) { return s->size == 0; }
bool push(linkStack *s, Datatype data) { struct Node *new = malloc(sizeof(struct Node)); if(new == NULL) return false; new->data = data; new->next = s->top; s->top = new; s->size++; return true; }
bool pop(linkStack *s, Datatype *data) { if(is_empty(s)) return false; *data = s->top->data; struct Node *tmp = s->top; s->top = s->top->next; s->size--; free(tmp); return true; }
bool top(linkStack *s, Datatype *data) { if(is_empty(s)) return false; *data = s->top->data; return true; }
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