88 CHAPTER 5 Scripting
select x
case 3,4,7; print "3, 4, or 7"
case 10 to 20; print "10 to 20"
case_else print "neither"
end_select
The first case statement specifies a list of values that can be of arbitrary
length. If the value of x matches a list element, the instruction behind the
semicolon is executed. In contrast, the second case statement specifies a
value range. If the value of x is within that range, the statement behind the
semicolon is executed. Optionally, a case_else statement can be used to
execute a statement if none of the specified case statements did apply. If
you want to execute more than one instruction after a case statement, you
must enclose those instructions into a subroutine and call it with gosub
(section 5.3.8).
Note: If you also plan to write scripts that run on the Stereo Data Maker
( SDM, section 7.9), you should avoid the select statement because it is not
supported in the SDM.
5.3.6 Loops
The for-loop is used to increment a counter from a start value to an end
value and to execute the instructions within the loop for each counter
value:
for i = 1 to n
sleep 10000
print "Shot", i, "of", n
shoot
next i
takes n shots every ten seconds and prints a protocol for each shot on the
display. As you can see, the for-construct is closed with the command next
specifying the variable to be incremented.
By default, the increment value of the for-construct is 1. By using the
step clause, however, it is possible to specify a different increment value:
for i = 1 to 10 step 3
print i
next i
will print the values 1, 4, 7, 10.
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