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.

Read more about this topic:  Sather

Famous quotes containing the word world:

    “The world below the brine,
    Forests at the bottom of the sea, the branches and leaves,”
    —Walt Whitman (1819–1892)

    “It is an evil world. The fires of hatred and violence burn fiercely. Evil is powerful, the devil covers a darkened earth with his black wings. And soon the end of the world is expected. But mankind does not repent, the church struggles, and the preachers and poets warn and lament in vain.”
    —Johan Huizinga (1872–1945)