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p4_9dc.seq
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1990-04-12
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1KB
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46 lines
\ Problem 4.9 04/11/90 16:25:31.08
VARIABLE A VARIABLE B VARIABLE C VARIABLE N
VARIABLE AA+BB
: XNEW ( n xold -- n xnew )
2DUP / + 2/ ;
: SQRT ( n -- root )
DUP 0< IF ABORT" Illegal argument" THEN
DUP 1 >
IF DUP 2/
10 0 DO XNEW LOOP NIP
THEN ;
: .ABC
CR A @ 12 .R B @ 12 .R C @ 12 .R ;
: MULTIPLE? ( -- flag )
A @ 2 MOD B @ 2 MOD C @ 2 MOD + + IF FALSE ELSE TRUE THEN ;
: .ABC? ( -- flag )
MULTIPLE? NOT IF .ABC 1 N +! THEN ;
: FIND_TRIPLE ( -- )
A @ DUP * B @ DUP * + DUP AA+BB !
SQRT 142 SWAP DO I DUP * AA+BB @
2DUP > IF 2DROP LEAVE THEN
= IF I C ! .ABC? THEN
LOOP ;
: TRIPLES ( -- )
0 N !
100 1 DO I A !
100 I DO I B !
FIND_TRIPLE
LOOP
LOOP
CR CR 12 SPACES ." Number of TRIPLES : " N @ . ;