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bench.pas
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Wrap
Pascal/Delphi Source File
|
1984-04-29
|
1KB
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60 lines
(**************************************************
*
* BENCHMARK PROGRAM
*
* In the September issue of Byte, there was a article
* that claimed to benchmark 50 high level languages.
* This is the Pascal version they used. I wanted to see
* if I get the same results. So I am typing it in from
* page 182, listing 2. The algorithm is the most in-
* teresting part of it.
*
* Charlie Foster, September 1981
***************************************************)
(*Eratosthenes Sieve Prime number program*)
PROGRAM Prime;
CONST
Size = 8190;
VAR
Flags : ARRAY [0..Size] OF BOOLEAN;
x,I, Prime, K, Count, Iter : INTEGER;
BEGIN
WRITELN ('10 iterations');
FOR Iter := 1 TO 10 DO
BEGIN
{initialize everything first}
Count := 0;
{article had= FillChar (Flags, Sizeof (Flags),CHR (TRUE));}
{But it should have had-----}
FOR x := 0 TO Size DO
Flags [x] := TRUE;
WRITELN ('Everything initialized--OK');
{back to the article--------}
FOR I := 0 TO Size DO
IF Flags[I] = TRUE THEN
BEGIN
Prime := I+I+3;
K := I+Prime;
WHILE K <= Size DO
BEGIN
Flags [K] := FALSE;
K := K+Prime
END;
Count := Count + 1;
WRITE (Prime)
END;
WRITELN
END;
WRITELN;
WRITELN ('There are ',Count:4,' Primes')
END.