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Boolean expressions

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    This subchapter looks at Boolean expressions.

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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.

Boolean expressions

    This subchapter looks at Boolean expressions.

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.

    The JOVIAL operators are summarized in the following table:

         Type          Operators       Operation

         Logical       NOT             (prefix) "not"
                       AND   OR        "and", "or"
                       XOR   EQV       "exclusive or", "equivalent"

    A relational operator compares any two values of the same type
    and produces a Boolean value as its result.  A logical operator
    takes bit-string values and also produces a Boolean result.  (A
    Boolean value is a one-bit bit-string, representing "true" or
    "false", depending on whether it is one or zero.)

    The JOVIAL operators are described in detail in Chapter 11,
    where, for example, you will find the rules for operations on
    fixed values and for the comparison of such objects as
    character-strings and pointers.

    Chapter 1 Introduction, page 8


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    †UNIX used as a generic term unless specifically used as a trademark (such as in the phrase “UNIX certified”). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.

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    Copyright © 2010, 2012 Milo

    Created: December 10, 2010

    Last Updated: October 16, 2012


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