Apple II User Manual

                    command level and OK is typed.

                    Prints "BREAK IN LINE XXXX," where XXXX is the line

                    number of the next statement to be executed.

                    There is no F1 key on a TTY.  However, when TTY is being

                    used, the AIM 65's F1 key is operational and can be used.

    : (colon)       A colon is used to separate statements on a line.  Colons may

                    be used in direct and indirect statements.  The only limit on

                    the number of statements per line is the line length.  It is not

                    possible to GOTO or GOSUB to the middle of a line.

    ?               Question marks are equivalent to PRINT.  For instance, ? 2+2

                    is equivalent to PRINT 2+2.  Question marks can also be used

                    in indirect statements.  10 ? X, when listed, will be typed as

                    10 PRINT X.

    $               A dollar sign ($) suffix on a variable name establishes the

                    variable as a character string.

    %               A percent sign (%) suffix on a variable name establishes the

                    variable as an integer

    !               An exclamation sign (!) suffix on an INPUT, PRINT, or ?

                    command causes the input or output to be printed even

                    though the printer is turned off.

    ESC             Returns control to the Monitor.

    CNTL PRINT      Turns the AIM 65 printer on if it is off, and off if it is on.

302  OPERATORS

    SYMBOL          SAMPLE STATEMENT        PURPOSE/USE

    ------          ----------------        -----------

    =               A=100                   Assigns a value to a variable

                    LET Z=2.5               The LET is optional

    -               B=-A                    Negation.  Note that 0-A is subtraction,

                                            while -A is negation.

    ^ (F3 key)      130 PRINT X^3           Exponentiation (equal to X*X*X in

                                            in the sample statement)

                                            0^0=1    0 to any other power = 0

                                            A^B, with A negative and B not an

                                            integer gives an FC error.

    *               140 X=R*(B*D)           Multiplication.

    /               150 PRINT X/1.3         Division.

    +               160 Z=R+T+Q             Addition

    -               170 J=100-I             Subtraction

RULES FOR EVALUATING EXPRESSIONS:

1)  Operations of higher precedence are performed before operations of lower precedence.

    This means the multiplication and divisions are performed before additions and subtractions.

    As an example, 2+10/5 equals 4, not 2.4.  When operations of equal precedence are found

    in a formula, the left hand one is executed first:  6-3+5=8, not -2.

2)  The order in which operations are performed can always be specified explicitly through the

    use of parentheses.  For instance, to add 5 to 3 and then divided that by 4, we would use

    (5+3)/4, which equals 2.  If instead we had used 5+3/4, we would get 5.75 as a result