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INDEXING ARRAYS
CRIMSON USER MANUAL - MODULAR CONTROLLER
INDEXING ARRAYS
Elements within an array tag can be selected by following the array name with square
brackets that contain an indexing expression. This expression must range from 0 to one less
than the number of elements in the array. If you create a 10-element array, for example, the
first element will be Name[0] and the last will be Name[9].
INDEXING STRINGS
Square brackets can also be used to select characters within a string. For example, if you have
a tag called Text that contains the string “ABCD”, then the expression Text[0] will return a
value of 65, this being equal to the ASCII value of the first character. Index values beyond the
end of the string will always return zero.
ADDING STRINGS
As well as adding numbers, the addition operator can be used to concatenate strings. Thus, the
expression "AB"+"CD" evaluates to "ABCD”. You may also use the addition operator to add
an integer to a string, in which case a single character equal to the ASCII code represented by
the integer is appended to the data in the string.
CALLING PROGRAMS
Programs that return values may be invoked within expressions by following the program
name with a pair of parentheses. For example, Program1()*10 will invoke the associated
program, and multiply the return value by 10. Obviously, the return type for Program1 must
be set to integer or floating-point for this to make sense.
USING FUNCTIONS
Crimson provides a number of predefined functions that can be used to access system
information, or to perform common math operations. These functions are defined in detail in
the Function Reference. They are invoked using a syntax similar to that for programs, with
any arguments to the function being enclosed within the parentheses. For example, cos(0)
will invoke the cosine function with an argument of 0, returning a value of +1.0.
PRIORITY SUMMARY
The table below shows the priority of all the operators defined in this section…
GROUP
OPERATORS
Group 1 .
Group 2 ! ~
Group 3 * / %
Group 4 + -
Group 5 >
Group 6 < > =
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