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:
“Orthodoxy is the Bourbon of the world of thought. It learns not, neither can it forget.”
—Thomas Henry Huxley (182595)
“But, where the road runs near the stream,
Oft through the trees they catch a glance
Of passing troops in the suns beam
Pennon, and plume, and flashing lance!
Forth to the world those soldiers fare,
To life, to cities, and to war!”
—Matthew Arnold (18221888)
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