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TRUNCATE(num)

This function operates similarly to the ROUND

function, but simply drops the extra digits

instead of rounding up or down. It is

somewhat similar in effect to the FLOOR

function but the TRUNCATE function will work

to any number of decimal places or significant figures instead of always

dropping to the nearest lower integer value.

Eg. TRUNCATE(3405.6375,-6) = 3405.63

TRUNCATE(32.889,1) = 32.8

See also: INT, FLOOR, CEILING, ROUND,FRAC

XPON(num)

This function returns the exponent (indicial

part) when transformed into scientific notation

of the number you feed it. It would be used

with the XPON function, which returns the

power part of the number when in scientific

notation.

Eg. Change 487 23

⋅

into scientific notation to get

4 8723 10⋅×.

MANT(487.23) = 4.8723

XPON(487.23) = 2

Change

0 0005087⋅ into scientific notation to get

5 087 10

−

⋅× .

MANT(0.0005087) = 5.087 XPON(0.0005087) = -4

This function could be of use to you if you are just learning scientific notation,

but is of more use to people writing programs. A normal user would just look

at the number and see the answer, but a programmer would not know in

advance what number was going to be used and so might use MANT and

XPON.

HP 39G Master Guide

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