The evaluation process of AutoLISP expressions is similar to the order of operations in mathematics. When expressions are nested, they are always evaluated from the innermost expression to the outermost. AutoLISP expressions can be nested inside of each other. The following are some examples of AutoLISP expressions:Īs an AutoLISP program grows in complexity, so will the expressions that you create. The ! (exclamation point) character can only be used at the AutoCAD Command prompt and is used to return the current value of an AutoLISP variable. In addition to an AutoLISP expression starting with a ( (open parenthesis), an expression can also start with the ! character. Most function topics also include example code to help you get started with that function.Īt first glance, the syntax used by AutoLISP expressions in a program can be intimidating but with a little bit of practice and time you will get used to it.
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