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  ALGOL 68
       
           An extensive revision of ALGOL 60 by Adriaan van
          Wijngaarden et al.  ALGOL 68 was discussed from 1963 by
          Working Group 2.1 of IFIP.  Its definition was accepted in
          December 1968.
       
          ALGOL 68 was complex, and posed difficulties for both
          implementors and users.  It featured structural equivalence;
          automatic type conversion ("{coercion") including
          dereferencing; flexible arrays; generalised loops
          (for-from-by-to-while-do-od), if-then-elif-fi, an integer case
          statement with an 'out' clause; skip and goto statements;
          blocks; procedures; user-defined operators; procedure
          parameters; concurrent execution (cobegin/coend);
          semaphores; generators "heap" and "loc" for dynamic
          allocation.  It had no abstract data types or separate
          compilation.
       
          (1995-05-01)