Carousel/CAROUSEL.cdr/mactosh/util/simulare.sit/Simula 4.07 Reference/card_33570.txt

Text File | 1989-05-02 | 2KB | 81 lines

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The user can define his own types with the
Class mechanism. Class abstractions contain
both data and operations. These are all called
attributes of the class.

Each instance of a class (an object) has its own
copy of the attributes. When an object is created
the parameters must be supplied and its body is
executed.





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Class definition

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class Stack(size); integer size;
begin   integer Top;
     integer array Storage(1:size);
     procedure Push(v); integer v;
     begin
          if Top>Size then Error("Overflow");
          Top:=Top+1; Storage(Top):=v;
     end --- Push --- ;
     integer procedure Pop;
     begin
        if Top=0 then Error("Underflow");
        Pop:=Storage(Top); Top:=Top-1;
     end -- Pop --- ;

    !  ---- class body ---- ;
   Top:=0;
end --- Stack ---;