Template:Prelude/pow mod.a68: Difference between revisions
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(change clude to lude...) |
(fix squaring of INT MOD base) |
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e:=e OVER 2; |
e:=e OVER 2; |
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WHILE e /= 0 DO |
WHILE e /= 0 DO |
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sq |
sq := sq * sq %* mod; |
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IF ODD e THEN out := out * sq %* mod FI ; |
IF ODD e THEN out := out * sq %* mod FI ; |
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e:=e OVER 2 |
e:=e OVER 2 |
Revision as of 16:35, 2 May 2009
COMMENT This routine is used in more than one place, and is essentially a template that can by used for many different types, eg INT, LONG INT... USAGE MODE POWMODSTRUCT = INT, LONG INT, COMPL, FRAC, MODULAS, MATRIX etc PR READ "prelude/pow_mod.a68" PR END COMMENT
PROC pow mod = (POWMODSTRUCT b,in e, mod)POWMODSTRUCT: ( POWMODSTRUCT sq := b, e := in e; POWMODSTRUCT out:= IF ODD e THEN b ELSE 1 FI; e:=e OVER 2; WHILE e /= 0 DO sq := sq * sq %* mod; IF ODD e THEN out := out * sq %* mod FI ; e:=e OVER 2 OD; out )