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26 Section 1: Getting Started
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 26 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
Chain Calculations in ALG Mode
To do a chain calculation, you don’t need to press
}
after each operation, but
only at the very end.
For instance, to calculate
360
12x750
you can enter either:
z 750 § 12 } z 360 } or
z 750 § 12 z 360 }
In the second case, the
z
key acts like the
}
key by displaying the result of 750
× 12.
Here’s a longer chain calculation:
9.1
68
5.18
75456
×
−
This calculation can be written as: 456 – 75 ÷ 18.5 × 68 ÷ 1.9. Watch what
happens in the display as you key it in:
Keystrokes
(ALG mode)
Display
OO
0.00
Clears any pending operations.
456
-
75
z
381.00
Subtracts 75 from 456.
18.5
§
20.59
Divides 381 by 18.5.
68
z
1,400.43
Multiplies by 68.
1.9
}
737.07
Divides by 1.9 and displays the
result.
Parentheses Calculations
In ALG mode, parentheses can be used in calculations to change the order in
which operations are evaluated. When there are pending open parentheses, the
( )
status indicator will be shown in the display. As open parentheses are closed, the
expression contained within the parentheses is evaluated, from left to right. The
final result of a calculation will be displayed when you press the
³
key, and then
any pending parentheses will be closed. You can’t use more than 13 pending
(opened) parentheses at the same time.
For example, suppose you want to calculate:
)15(
8
−
Keying 8 ÷ 5 – 1 will calculate 8 ÷ 5 first and then the result (1.6) will have 1
subtracted from it (resulting in 0.6), which is not what is intended.