Sinclair QL User Manual

GOTO
For compatibility with other BASICs, SuperBASIC supports the Gam statement. Gam
will unconditionally transfer processing to the statement number specified. The statement
number specification can be an expression.
•
Gam line~number
syntax:
example:
I. GOTO program start
ii. GOTO 9999 -
comment The control structures available In SuperBASIC make the GOTO statement redundant.
•
IF
THEN
ELSE
END IF
The IF statement allows conditions to be tested and the outcome of that test to control
subsequent program
flow.
The IF statement can be used in both a long and a short form:
short The THEN keyword is followed on the same logical line by a sequence of SuperBASIC
keyword.
This sequence of SuperBASIC statements may contain an ELSE keyword. If
the expression in the IF statement is true (evaluates to be non-zero), then the statements
between the THEN and the ELSE keywords are processed.
If the condition is false
(evaluates
to be zero) then the statements between the ELSE and the end of the line
are processed.
If the sequence of SuperBASIC statements does not contain an ELSE keyword and if •
the expression
in the IF statement is true, then the statements between the THEN keyword
and the end of the line are processed.
If the expression is false then processing continues
at the next line.
syntax: statements: = statement * [: statement] *
IF expression THEN statements [:ELSE statements]
example: i. IF a:32 THEN PRINT "Lim;t" : ELSE PRINT "OK
II
ii. IF test> maximum THEN LET maximum = test
iii. IF "1"+1=2 THEN PRINT "coercion OK"
long 1 The THEN keyword is the last entry on the logical line. A sequence of SuperBASIC
statements
is written following the IF statements. The sequence is terminated by the END
IF statement. The sequence of SuperBASIC statements
is executed if the expression
contained
in the IF statement evaluates to be non zero. The ELSE keyword and second
sequence of SuperBASIC statements are optional.
long 2 The THEN keyword is the last entry on the logical line. A sequence of SuperBASIC
statements follows
on subsequent lines, terminated by the ELSE keyword. IF the
expression contained
in the IF statement evaluates to be non zero then this first sequence
of SuperBASIC statements
is processed. After the ELSE keyword a second sequence
of SuperBASIC statements is entered, terminated by the END IF keyword, If the expression
evaluated by the IF statement
is zero then this second sequence of SuperBASIC
statements
is processed.
•
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Sinclair QL Specifications

General

Processor	Motorola 68008
Clock Speed	7.5 MHz
RAM	128 KB (expandable to 640 KB)
ROM	48 KB
Operating System	Sinclair QDOS
Release Year	1984
Storage	Microdrive tape loop
Graphics	256x256 pixels, 8 colors
Ports	RS-232, ROM cartridge
Sound	Beeper (internal speaker)