Commodore Plus 4 - Page 152

NEXT NEXT Wanable,.,. .variable \
The NEXT statement is used with the FOR statement. When the com
puter encounters a NEXT statement, it goes back to the corresponding
FOR statement and checks the loop variable. (See FOR statement (or
more detail.) If the loop is finished, execution proceeds with the state
ment after the NEXT statement. The word NEXT may be followed by a
variable name, a list of variable names separated by commas, or no
variable names. If there are no names listed, the last loop started is the
one being completed. If the variables are given, they are completed in
order from left to right. —
EXAMPLE: _
10FORL - 1TO 10:NEXT
20 FOR L - 1TO 10:NEXTL _
30 FOR L = 1TO 10:FORM - 1 TO 10: NEXT M, L
QJI ON expression < GOTO GOSUB > line #7 [.line #2,...)
This command can make the GOTO and GOSUB statements into spe
cial versions of the IF statement. The word ON is followed by a formula,
then either GOTO or GOSUB. and a list of line numbers separated by —
commas, if rhe result of the calculation of the formula (expression) is
1, the first line in the list is executed. If the result is 2, the second line
number is executed, and so on. If the result is 0, or larger than the
number of line numbers in the list, the next line executed is the state
ment following the ON statements. If the number is negative, an —
ILLEGAL QUANTITY ERROR results.
EXAMPLE: WhenX=1.ON
sends control to the
10 INPUT X:IF X- 0 THEN 10 first line number in
the list.
20 ON X GOTO 50, 30, 30, 70
WhenX- 2, ON
25 PRINT "FELL THROUGH":GOTO 10 sends control to the
second line (30), etc. —
30 PRINT "TOO HIGH":GOTO 10
50 PRINT "TOO LOW":GOTO 10
70 END
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