Chapter 1 - Teach Yourself Scheme in Fixnum Days[Go to...

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Teach Yourself Scheme in Fixnum Days [Go to first , previous , next page; contents ; index ] Chapter 1 Enter Scheme The canonical first program is the one that says "Hello, World!" on the console. Using your favorite editor, create a file called hello.scm with the following contents: ;The first program (begin (display "Hello, World!") (newline)) The first line is a comment. When Scheme sees a semicolon, it ignores it and all the following text on the line. The begin - form is Scheme's way of introducing a sequence of subforms . In this case there are two subforms. The first is a call to the display procedure that outputs its argument (the string "Hello, World!" ) to the console (or ``standard output''). It is followed by a newline procedure call, which outputs a carriage return. To run this program, first start your Scheme. This is usually done by typing the name of your Scheme executable at the operating-system command line. Eg, in the case of MzScheme [ 9 ], you type mzscheme at the operating-system prompt. This invokes the Scheme listener , which read s your input, eval uates it, print s the result (if any), and then waits for more input from you. For this reason, it is often called the
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