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#ifndef STACK_H
#define STACK_H
#include <stdlib.h>
#include "util.h"
#define STACK_MAXLEN 256
typedef struct STACK {
int sp; /* Index of first unused element of val. */
void* val[STACK_MAXLEN];
} stack_t;
stack_t* stack_init();
void stack_destroy(stack_t*);
void stack_push(stack_t* stack, void* val);
void* stack_pop(stack_t* stack);
size_t stack_len(stack_t* stack);
void stack_print(stack_t* stack);
#endif
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