music

# 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.

## free computer programming text book project

If you like the idea of this project,
then please donate some money.

### 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

## JOVIAL

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

# 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).

## view text bookHTML file

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.

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## free computer programming text book project

Building a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming.

If you like the idea of this project,
then please donate some money.

send donations to:
Milo
PO Box 1361
Tustin, California 92781

Supporting the entire project:

If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church)

Some or all of the material on this web page appears in the
free downloadable college text book on computer programming.

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