Defun is the first actual command and is followed by the name of the function or program. In AutoLisp the name of the program or function must be defined in the first statement, which is done by using the command. Remember to come out of the nest with an equal number of parentheses.

As you add parentheses, you're nesting commands become deeper and deeper. In turn, that command can act on another. AutoLisp uses parentheses to nest, allowing you to write a command that acts on evaluates another command. All commands are surrounded by parentheses. Parentheses are vital to writing AutoLisp programs. A semicolon does not have to begin the line. Write notes about your program, what you are doing and what the variables are. It is used for documentation and explanation of your program. When you begin a line with a semicolon, anything you write after will be ignored by AutoLisp. Structure your program in such a way that it is easy to understand, by yourself and everyone else. In AutoLisp, variables may be a collection of letters or numbers as long as they begin with the letters.Īn AutoLisp variable may contain more than one value in a single variable. These are like empty boxes in which to store data, to be used later. Is a pre-defined set of instructions that describes a set of actions that AutoLisp is to perform, divided into three sections.

All AutoLisp programs must contain the suffix '. You can then lookup the relevant AutoLisp commands for a more detailed explanation.

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