T-FLEX Parametric CAD. Fundamentals. 2D Design

Variables
Attachment I. Rules for Writing Expressions. Functions for Working
with Variables
Expression
Expressions determining the values of the variables can contain operands (real constants and variables, text
constants and variables) and operations (a set of actions upon these variables). Expressions can also include
functions.
Members of Expressions
Numerical constants.
Numerical variables.
String variables.
Numerical constants may not contain spaces.
Examples of correctly defined constants:
2; 3.344; -2.34; 1.234e+5; 1.2344E-32; 0.0034;
Examples of incorrectly defined constants:
2,34 – the comma is not allowed as the decimal symbol.
1.234 e+5 – inadmissible “space” symbol is used in a constant.
Note for local language users: in the exponential number representation, use only the US ASCII “E” or “e”.
String constants.
A string constant is an arbitrary string entered in quotes:
“This is a string constant!”
Should a string constant include the quote symbol (“), it must be preceded by the backslash symbol (\).
“This is another \”string\” constant!”
The above is the way to enter a string constant, whose value is to read,
This is another ”string” constant!
To have the backslash symbol a part of a string constant, it must be duplicated.
Example:
“This \\is\\ t\w\o\!”
The value reads,
This \is\ two!
Note that a single backslash is ignored throughout.
Instructions (Operations) Used in Expressions
The string members can only be subject to the operation
concatenate, or, simply, addition of two strings ( + )
“T-FLEX”+” CAD” = T-FLEX CAD
The numerical members are subject to common arithmetic operations, as
addition ( + )
493