NDLI: Blocks—a new datatype for SNOBOL4

Content Provider	ACM Digital Library
Author	Gimpel, James F.
Abstract	A new datatype, called a block, has been implemented for SNOBOL4. A block is a three-dimensional aggregate of characters in the form of a right parallelepiped, best thought of as a three-dimensional extension to a string. (The third dimension is used for overstriking.) Blocks may be printed, concatenated in any of three dimensions, and merged on the basis of program-defined connection points. Some blocks adapt in size and shape to their environment.Blocks and their operations are mainly used for composing printable output. A variety of graphical problems (including flowcharting, bargraphs, logic diagrams, mathematical-equation formation, and text justification and preparation) have been programmed on a printer in what appears to be an easy and natural way. In addition to these somewhat specialized applications, blocks appear to be a good general purpose device-independent output formation mechanism especially suitable for nonnumerical work.The concept of a block is largely language independent. That is, blocks require little in the way of specialized syntax and could readily be absorbed into the external structure of most programming languages.
Starting Page	438
Ending Page	447
Page Count	10
File Format	PDF
ISSN	00010782 15577317
DOI	10.1145/361405.361410
Journal	Communications of the ACM (CACM)
Volume Number	15
Issue Number	6
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-08-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Graphics Two-dimensional mathematics Flowcharting Output formatting Datatypes Snobol4 String processing Nonnumerical programming Character manipulation Text processing
Content Type	Text
Resource Type	Article
Subject	Computer Science Computer Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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