music programming text book

character strings


    Representing character strings in a computer.

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    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.

character strings

    Representing character strings in a computer.

character string type

    Almost every programming language has a method for storing and using character strings, but not all have a fundamental string type.


    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.

    The kinds of values provided by JOVIAL reflect the applications
    of the language; they are oriented toward engineering and contrl
    programming rather than, for example, commercial and business
    programming.  The JOVIAL values are:
    5.  Character-string values, which are sequences of
        characters. They are used for communication with people.
        For example, a character-string could be sent to an
        operator terminal to report failure of a portion of the

    Chapter 1 INTRODUCTION, page 2

         ITEM MESSAGE C 80;    A character-string item, whose value
                               is a sequence of eighty characters.
                               This it can accommodate, for example,
                               the message "WARNING: Cooling system
                               failure" (with plenty of character
                               positions left over).

    Chapter 1 INTRODUCTION, page 5


    In ALGOL 68 the string mode is declared with the reserved word string.

    The string type is actually a flexible array of characters (flexible arrays are aarrays that can grow in size).

string    InputCharacters;


    Python includes the core built-in type basestring. Noninstantiable common basetype of types str and unicode.

    To determine if an object x is a string, use the following test:

    isinstance(x, basestring)

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:

    Create your own copy from the original source code/ (presented for learning programming).

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free computer programming text book project

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    Created: December 12, 2010

    Last Updated: September 20, 2012

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