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/* main.c */
 
#include <stdio.h>
#include <stdlib.h>
 
#include "stack.h"
 
int main(int argc, char *argv[]) {
     stack *stk = NULL;
     push(7, &stk);
     push(2, &stk);
     push(9, &stk);
     push(12, &stk);
     push(88, &stk);
     printf("%d\n", pop(&stk));
     printf("%d\n", pop(&stk));
     printf("%d\n", pop(&stk));
     printf("%d\n", pop(&stk));
     printf("%d\n", pop(&stk));
     return 0;
}