Sather - Hello World

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 from MAIN, it must be specified as a compiler option.
  • # is the constructor symbol, calling method create of the corresponding class; here it is used for instantiating the OUT 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 for a.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.

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Famous quotes containing the word world:

    “Thus were we weaned to knowledge of the Will
    That wills the natural world but wills us dead.”
    —Louis MacNeice (1907–1963)

    “I passed a little further on and heard a lotus talk:
    Who made the world and ruleth it, He hangeth on a stalk,
    For I am in His image made, and all this tinkling tide
    Is but a sliding drop of rain between His petals wide.”
    —William Butler Yeats (1865–1939)