package main

type Error int

const (
	ErrorUnknownOpcode Error = iota
	ErrorDivideByZero
	ErrorWrongOperandCount
	ErrorNegativeShiftAmount
)

func (err Error) Error () (description string) {
	switch err {
	case ErrorUnknownOpcode:
		description = "unknown opcode"
	case ErrorDivideByZero:
		description = "division by zero"
	case ErrorWrongOperandCount:
		description = "wrong operand amount"
	case ErrorNegativeShiftAmount:
		description = "negative shift amount"
	}
	return
}