Ulam spiral (for primes): Difference between revisions
m
→using FreePascal
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<lang Pascal>
PROGRAM Ulam.pas;
{$IFDEF FPC}
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{$APPTYPE CONSOLE}
{$ENDIF}
(*)
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Only odd numbers work
(*)
SIZE = 9 ;
MSIZE = SIZE * ord ( Odd ( SIZE ) ) ;
TYPE
D2Arr = array of array of string ;
FUNCTION IsPrime ( n: integer ): boolean ;
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END;
PROCEDURE Init2DArr ( Arr: D2Arr ) ;
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mid: integer = MSIZE div 2 ;
BEGIN
FOR j:= 1 to MSIZE - mid - 1 DO
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END;
PROCEDURE Advance ( var Turn_cnt, x, y: integer ) ;
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END;
PROCEDURE Add2DArr ( Arr: D2Arr ) ;
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END;
PROCEDURE Show2DArr ( Arr: D2Arr ; glyph : Boolean ) ;
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END;
VAR
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BEGIN
IF ( MSIZE = 0 ) THEN
BEGIN
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Show2DArr ( Arr , False ) ;
Show2DArr ( Arr , True ) ;
END.
</lang>JPD 2021/06/14
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