Hello World
class HELLO_WORLD is main is #OUT+"Hello World\n"; end; end;A few remarks:
- Class names are ALL CAPS; this is not only a convention but is enforced by the compiler.
- The method called
main
is the entry point for execution. It may belong to any class, but if this is different fromMAIN
, it must be specified as a compiler option. #
is the constructor symbol, calling methodcreate
of the corresponding class; here it is used for instantiating theOUT
class, which is actually stdout.- The
+
operator has been overloaded here to stand for stream append. - Operators such as
+
are syntactic sugar for conventionally named method calls:a + b
stands fora.plus(b)
. The usual arithmetic precedence conventions are used to resolve the calling order of methods in complex formulae. - The program layout allows for pre- and post-conditions (not shown here), showing Sather's Eiffel lineage.
Read more about this topic: Sather
Famous quotes containing the word world:
“But when did love not try to change
The world back to itself no cost,
No past, no people else at all
Only what meeting made us feel,
So new, and gentle-sharp, and strange?”
—Philip Larkin (19221986)
“In the operative opinion of the world, he who is already fully provided with what is necessary for him, that man shall have more; while he who is deplorably destitute of the same, he shall have taken away from him even that which he hath. Yet the world vows it is a very plain, downright matter-of-fact, plodding, humane sort of world.”
—Herman Melville (18191891)
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