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.

    1.1.4 Operators

    The operations provided by JOVIAL reflect the applications of the
    language; they determine what the language can and cannot do.
    Thus JOVIAL is strong in numerical calculation and control logic,
    but has minimal operations for text processing.

    JOVIAL does not have any operations for input-output or file
    maintenance because it is assumed that a JOVIAL program runs in a
    relatively specialized environment that provides subroutines for
    those operations.

    Some of the operations of JOVIAL are represented by operators,
    others by built-in functions.

    Chapter 1 Introduction, page 7

    The JOVIAL operators are summarized in the following table:

         Type          Operators       Operation

         Arithmetic    +   -           prefix signs
                       **              exponentiate
                       *   /   MOD     multiply, divide, and modulus
                       +   -           infix add and subtract

         Relational    <   >   =       less than, greater than, equal
                       <=  >=  <>      less than or equal,
                                          greater or equal, not equal

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

    An arithmetic operator takes integer, float, or fixed values as
    its operands and produces an integer, gloat, fixed value as its
    result.  Type classes cannot be mixed.  For example, a fixed
    value cannot be added to a float value unless one is explicitly
    converted to the type of the other.

    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