Utilization in arithmetic expressions

Macro name can be allocated to arithmetic expressions and parts thereof. Recursive treatment (nesting) is possible within arithmetic expressions, too. It must be ensured that a string always combines complete levels (i.e. terms whose results are not influenced by inserting '[' at the beginning and ']' at the end).

Programming example

Correct:

N10 "STRING1" = "0.5" 
N20 "STRING2" = "5 * 12" 
N30 "STRING3" = "SIN[89.5 + \"STRING1\"]" 
N40 X[-2 * "STRING1" + "STRING2" + "STRING3"] (Moving to X60) 
M30 

Incorrect: Only complete arithmetic expressions may be combined in a string

N10 "STRING1" = "COS[" 
N20 "STRING2" = "90]" 
N30 "STRING3" = " \"STRING1\" \"STRING2\" " Error