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calculations
summary
The first computers were used for calculations, hence the English word “computer”. Prior to modern computers there were many individuals who were employed as computers. That was an actual job title. Many businesses needed a team of workers who spent all day computing and performing other oerations on numbers. That job disappeared because the machines are much faster and more accurate than a team of humans.
This section looks at writing programs that perform calculations.
stub section
This subchapter is a stub section. It will be filled in with instructional material later. For now it serves the purpose of a place holder for the order of instruction.
Professors are invited to give feedback on both the proposed contents and the propsed order of this text book. Send commentary to Milo, PO Box 1361, Tustin, California, 92781, USA.
calculations
The first computers were used for calculations, hence the English word “computer”. Prior to modern computers there were many individuals who were employed as computers. That was an actual job title. Many businesses needed a team of workers who spent all day computing and performing other oerations on numbers. That job disappeared because the machines are much faster and more accurate than a team of humans.
This section looks at writing programs that perform calculations.
“42.2/2 The specialized annexes define further predefined library packages and facilities with emphasis on areas such as real-time scheduling, interrupt handling, distributed systems, numerical computation, and high-integrity systems.” —:Ada-Europe’s Ada Reference Manual: Introduction: Language Summary See legal information
The following material is from the unclassified Computer Programming Manual for the JOVIAL (J73) Language, RADC-TR-81-143, Final Technical Report of June 1981.
1.1.3 Calculations
In the simplest case, calculations is performed by an assignment
statement. An example is:
AVERAGE = (X1 + X2)/2;
Chapter 1 Introduction, page 6
other
“65. Make no mistake about it: Computers process numbers - not symbols. We measure our understanding (and control) by the extent to which we can arithmetize an activity.” —Alan Perlis, Epigrams on Programming, ACM’s SIGPLAN Notices Volume 17, No. 9, September 1982, pages 7-13
chapter contents
free music player coding example
Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
View music player in action: www.musicinpublic.com/.
Create your own copy from the original source code/ (presented for learning programming).
Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.
Names and logos of various OSs are trademarks of their respective owners.
computers using 
and served using 
.
