typedef struct _Val Val;
typedef struct _Ope Ope;
typedef struct _Exp Exp;

typedef enum {INTE, REAL} ValKind;
struct _Val {
	ValKind kind;
	union {
		int i;
		double d;
	} u;
};

typedef enum {ADD, SUB, MUL, DIV} OpeKind;
struct _Ope {
	OpeKind kind;
	Exp *left;
	Exp *right;
};

typedef enum {VAL, OPE} ExpKind;
struct _Exp {
	ExpKind kind;
	union {
		Val v;
		Ope o;
	} u;
};

void to_bytecode_val(Val *val);
void to_bytecode_ope(Ope *ope);
void to_bytecode_exp(Exp *exp);