[C] Esercizio su pile/code

[kily_2001]

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

#define MAXSIZE 50

struct elem
{ 
   int d;
   struct elem* next;
};

typedef struct elem elem;

typedef struct stack
{
   int cnt;
   elem* top;
}stack;

void init(stack*);
void push(stack*,int); 
int pop(stack*);
int top(stack*);
int IsEmpty(stack*);
int IsFull(stack*);
void stampa(stack*);

void init(stack* stk)
{
     stk->cnt=0;
     stk->top=NULL;
}

void push(stack* stk, int d)
{
     elem* tmp=malloc(sizeof(elem));
     tmp->d=d;
     tmp->next=stk->top;
     stk->top=tmp;
     stk->cnt++;
}

int pop(stack* stk)
{
    int dato=stk->top->d;
    elem *tmp=stk->top;
    stk->top=stk->top->next;
    stk->cnt--;
    free(tmp);
    return dato;
}

int top (stack* stk)
{
    return stk->top->d;
}

int IsEmpty(stack* stk)
{
    return (stk->cnt==0);
}

int IsFull(stack* stk)
{   
    return (stk->cnt==MAXSIZE);
}

void stampa(stack* stk)
{
  if(stk->cnt==0) return;
  else
  {
    int tmp=pop(stk);
    printf("%d ",tmp);
    stampa(stk);
  }    
} 

questo è il mio stack.h