Floating point equations to integer equations?

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LucidGuppy
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Floating point equations to integer equations?

Post by LucidGuppy » Thu Sep 02, 2004 10:45 am

So computers don't really like floating point. If you have an equation thats in scientific notation how do you convert it so that it works with integers? For simple equations I'm fine but it gets pretty hairy when the equation has big exponents and stuff like that. Can any point me in the direction to an aproach to convert equations to integer equations?
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CeaSaR
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Re: Floating point equations to integer equations?

Post by CeaSaR » Thu Sep 02, 2004 12:00 pm

First thing that comes to mind is:
'to raise a number to a power use the carrat sign between the number to be raised and the power'. Ie: 2.45^20is 2.45 raised to the 20th power or 60718591.32 (that's as far as my handheld calc goes). At least that's the way QuickBasic does it.<p>Here's a sample:<p>1 COLOR 11, 5
CLS
PRINT : PRINT : PRINT : PRINT : PRINT
PRINT " BANDPASS BOX SPEAKER DESIGN PROGRAM"
PRINT : PRINT
INPUT " Fo="; FS
INPUT " Vas="; V
INPUT " Qts="; Q
2 INPUT " Low end cutoff="; FL
LET VF = (1.2 * Q) ^ 2 * V
LET A = FL / (FS / Q)
LET B = A + .95
LET FH = B * (FS / Q)
PRINT " LOW FREQUENCY CUTOFF="; FL; "Hz."
PRINT " HIGH FREQUENCY CUTOFF="; FH; "Hz."
INPUT " TRY ANOTHER FREQUENCY(1=Y,2=N)ENTER"; C
ON C GOTO 2, 3
3 PRINT
LET QT = A + .37
LET VB = V / (((QT / Q) ^ 2) - 1)
LET FB = QT * (FS / Q)
4 INPUT " CHOOSE DUCT SIZE BETWEEN 1 - 6 IN."; D
LET DA = (D / 2) ^ 2 * 3.14159
LET DL = ((2691 * DA) / (VB * (FB ^ 2))) - (.88 * SQR(DA))
LET VT = VF + VB
PRINT " DUCT IS"; DL; "IN. LONG"
INPUT " SATISFACTORY(1=Y,2=N)ENTER"; E
ON E GOTO 5, 4
5 CLS
PRINT : PRINT : PRINT : PRINT : PRINT : PRINT
PRINT " LOW FREQ. CUTOFF="; FL; "Hz."
PRINT " HIGH FREQ. CUTOFF="; FH; "Hz."
PRINT " FRONT BOX VOLUME="; VF; "CU. FT."
PRINT " REAR BOX VOLUME="; VB; "CU. FT."
PRINT " TOTAL BOX VOLUME="; VT; "CU. FT."
PRINT " FRONT BOX FREQ.="; FB; "Hz."
PRINT " DUCT SIZE="; D; "IN.DIAM. X"; DL; " IN. LONG"
INPUT " TRY ANOTHER DESIGN(1=Y,2=N)ENTER"; X
ON X GOTO 1, 6
6 CLS
PRINT : PRINT : PRINT : PRINT : PRINT : PRINT : PRINT : PRINT : PRINT : PRINT : PRINT : PRINT
PRINT " BASSY LISTENING!"
END<p>Have fun with it :D <p>CeaSaR
Hey, what do I know?

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