func init
	// initialize instance
	if(linked("Result") and linked("doOperation"))
		sys.add_var(this.name, 'dynamic')
		if(not isdef("Default"))
			blk_init.println(this.codename, ' = ', this.props("Default").value, ';')
		end
	end

	// initialize type of the numbers
	if(isdef("Op1"))
		this.type1 = this.get_type(this.props("TypeOp1").value)
	else
		this.type1 = typeof(this.props("Op1").value)
		if(this.type1 == 3)
			this.type1 = 7
		elseif(this.type1 == 2)
			this.type1 = this.get_type(this.props("TypeOp1").value)
		end
	end
	if(isdef("Op2"))
		this.type2 = this.get_type(this.props("TypeOp2").value)
	else
		this.type2 = typeof(this.props("Op2").value)
		if(this.type2 == 3)
			this.type2 = 7
		elseif(this.type2 == 2)
			this.type2 = this.get_type(this.props("TypeOp2").value)
		end
	end
end

func doOperation(data)
	if(linked("Result"))
		blk.println(this.codename, ' = ', this.make_result(data), ';')
		event("onResult", this.codename)
	else
		event("onResult", this.make_result(data))
	end
end

func make_result(data)
	return(this.typed('(' + sys.to_type(d("Op1"), this.type1) + ' ' + this.props("OpType").value + ' ' + sys.to_type(d("Op2"), this.type2) + ')'))
end

func typed(r)
	if(this.type1 == 1)
		sub(r, this.type2)
	else
		sub(r, this.type1)
	end
	return(r)
end

func get_type(t)
	if(t == 0)
		return(7)
	elseif(t == 1)
		return(108)
	elseif(t == 2)
		return(1)
	elseif(t == 3)
		return(105)
	elseif(t == 4)
		return(107)
	elseif(t == 5)
		return(0)
	end
end

func Result
	if(linked("doOperation"))
		return(this.codename)
	else
		return(make_result())
	end
end