By Cooper D.J.
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The nesting of multiple if expressions is possible, but not advised; later we will cover other constructs which are more appropriate for such cases. 2. THE LIST AS A DATA STRUCTURE 31 CL-USER(6): (length nil) 0 The length function, as with most of Common Lisp, can itself be implemented in CL. 4. In English, this function says basically: “If the list is empty, its length is zero. ” As with many functions which operate on lists, this recursive definition is a natural way to express the length operation.
Strings Strings are actually a specialized kind of Array, namely a one-dimensional array (vector) made up of characters. g. Unicode) such as Chinese Hanzi or Japanese Kanji. The string delimiter in CL is the double-quote character ("). As we have seen, strings in CL are a native data type which simply evaluate to themselves when included in an expression. ” Symbols are a type of CL object which provides your program with a built-in mechanism to store and retrieve values and functions, as well as being useful in their own right.
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. The value for any Parameter can always be changed from the toplevel with setq: CL-USER(11): (setq *todays-humidity* 30) 30 CL-USER(12): *todays-humidity* 30 Although setq will work with new variables, stylistically it should only be used with alreadyestablished variables.