By Stuart C. Shapiro
It is a first-class LISP e-book; maybe the easiest. The ebook is brief (~240 pages), stress-free to learn and comprises an intensive reference of the language at the back of the e-book. i might certainly suggest examining this ebook ahead of advancing onto Paul Graham's "On Lisp".
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Extra info for Common Lisp: An Interactive Approach (Principles of Computer Science Series)
A symbol’s name is an instance of another Common Lisp object type, called a string. So before pursuing the discussion of symbols and symbol names, we will have to discuss strings, and since a string is made up of characters (another type of Common Lisp object), we will have to discuss characters also. A string is a vector (single-dimensional array) of characters and is both read and printed by Lisp as a sequence of its characters surrounded by double quotes. " is a string. " 21 22 I: THE BASICS A string can be as long as you like and can contain strange characters such as the carriage return character.
1 (r) Type some small positive and negative integers, one per line. Note that Lisp types them back. Try typing some positive integers with the optional plus sign. 2 (i) Type some small ﬂoating-point numbers to Lisp. Note the representation Lisp uses in typing them back to you. 0000521347. Type them one per line and see how your Lisp responds. 0l-5. What exponent markers does your Common Lisp use in the . numbers it prints? 12s-5, and so on, adding digits to the right until you exceed the ability of short-float numbers to represent them.
This is not just a temporary technique, however. All Lisp programmers use this “desk calculator” mode all the time to develop and test their programs. You will, too. 2 (i) Ask Lisp to evaluate (notafunction 5 3). What is the error message when you try to evaluate a list that doesn’t begin with the name of a function? 3 (d) See what happens if you mistakenly leave out the blank between the operator and the ﬁrst argument by typing (+2 3) and (*2 3) to Lisp. 4 (d) See what happens if you mistakenly leave out the operator altogether, by typing (2 3) to Lisp.