Hello World (Lisp)

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(Common Lisp)

There are a lot of different ways to print "Hello World" on the console.

All functions print the same string to the console, but there are some minor differences:

The following function prints the string and appends a newline.

<<hello.lisp>>=
(write-line "Hello World")

This function prints "Hello World" (which is the string in READable form) and appends one newline.

<<hello.lisp>>=
(print "Hello World")

This function just prints the string.

<<hello.lisp>>=
(princ "Hello World")

This function prints the string READably.

<<hello.lisp>>=
(prin1 "Hello World")

Other possibilities include WRITE and FORMAT, the latter being lisps equivalent to C's printf (but on stereoids). In this example, T means, that the output should go to *STANDARD-OUTPUT*, which is usually the listener. Other strams may be used. If it were NIL, the string would just be returned without being printed at all. The ~% in the following format-string is format's \n.

<<hello.lisp>>=
(format t "Hello World~%")

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