#ifndef __STACK_H
#define __STACK_H

typedef double eltType;

struct STACKELT {
	eltType elt;
	struct STACKELT *next;
};
typedef struct STACKELT StackElt;

struct STACK {
	StackElt* top;
	unsigned int size;
};
typedef struct STACK Stack;

short pop(Stack *stack, eltType *value);
//pop returns 0 on success and -1 on failure.  If the function call is
//successful, *value will be the value removed from the stack
void push(Stack *stack, eltType val);
Stack* stack_init();
void stack_destroy(Stack *stack);

#endif //__STACK_H