Basic Lisp techniques by Cooper D.J.

By Cooper D.J.

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As you can see, the assignment section is a list of lists, where each internal list is a pair whose first is a symbol, and whose second is a value (which will be evaluated). These symbols (a and b) are the local variables, and they are assigned to the respective values. The body consists of any number of expressions which come after the assignment section and before the closing parenthesis of the let statement. The expressions in this body are evaluated normally, and of course any expression can refer to the value of any of the local variables simply by referring directly to its symbol.

Defvar and defparameter differ in one important way: if defvar is evaluated with a symbol which already has a global value, it will not overwrite it with a new value. Defparameter, on the other hand, will overwrite it with a new value: 26 CHAPTER 3. THE CL LANGUAGE CL-USER(4): *todays-temp* 90 CL-USER(5): *todays-humidity* 70 CL-USER(6): (defparameter *todays-temp* 100) *TODAYS-TEMP* CL-USER(7): (defvar *todays-humidity* 50) *TODAYS-HUMIDITY* CL-USER(8): *todays-temp* 100 CL-USER(9): *todays-humidity* 70 *todays-humidity* did not change because we used defvar, and it already had a previous value.

On the Symbolics platform, which has a more advanced filesystem, the version and host slots also have relevance. The constructor function, make-pathname, takes keyword arguments corresponding to the six possible slots of the pathname. txt" As seen in the above example, the :directory slot is technically a list, whose first is a keyword symbol (either :absolute or :relative), and whose rest is the individual directory components represented as strings. 6 File Input and Output Doing file input and output in CL is essentially a matter of combining the concepts of streams and pathnames.

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