DOI link for Interactive techniques
Interactive techniques book
The programs developed so far have been small and simple. Because they were designed to be used directly, any information they need is supplied by inputs. In some situations, however, it is useful to design interactive procedures that prompt the user for input information and filter out responses that could cause problems (see the MAKE. CHARACTER procedures at the end of Chapter 4). This chapter describes techniques for developing such "user-friendly," interactive programs in Logo.