/* stacku.h */

#ifndef STACKU_H
#define STACKU_H

#define TOS  100

#define CHAR   1
#define DOUBLE 2


struct Type {
	int tag;
	union {
		char cval;
		double dval;
	}item;
};

typedef struct Type Type;

struct Stack {
	int top;
	Type val[TOS];
};

typedef struct Stack Stack;

Stack * stack_new();
void stack_init(Stack *);
void stack_delete(Stack*);

int stack_isempty(Stack);
void stack_push(Stack *, Type);
Type stack_pop(Stack *);
Type stack_top(Stack);
void stack_print(Stack);

#endif