Hijack Calculator
Intro
The Hijack calculator allows you to perform basic calculations on your empeg, but it has
some serious limitations:
Integer only
The calculator is integer only, both when entering numbers and when displaying results.
Any fractional part in a result is truncated. For instance 15/4 which should yeild 3.75 shows 3.
-15/4 shows -3.
Priorities
Operation is infix, ie you pick the operator between entering the numbers, opposed to
postfix where you first enter the numbers and then the operator - common on HP calculators.
There is no prioritizing of */% over +- so an operation like 2+2*5 would yeild 20 (because it
is done as 2+2=4 *5=20) instead of 2+(2*5)=12 as the normal priority rules dictate.
Operation
Buttons
The calculator is controlled by the Menu and Cancel buttons (Rio remote) or the
CD and * buttons (Kenwood remote) as well as the number buttons (0 to 9).
The Menu/CD button acts as operator selector and the Cancel/* as Clear Entered,
Clear All and Quit.
Display
The available operations and corresponding buttons are listed as a guide at the top two lines of
the screen in the following fashion:
Menu/CD: +-*/%=
Cancel/*: CE.CA.Quit
The two lower lines display previous (partial) result and the number you're currently entering,
respectively.
The currently selected operation is shown in the lower left hand corner.
Available functions
The available mathematical operations are
- + : addition
- - : subtraction
- * : multiplication
- / : division
- % : modulus
- = : end calculation
Using Cancel/*
To clear an erroneous number entry (ie you meant to press 5 but mistakenly pressed 2),
press Cancel/* once (CE, Clear Entered). The entire entered number is erased, not only the
last digit. You can not in this situation press Menu/CD to change the selected operation -
you can only enter another number.
If you press Cancel/* in the situation where the calculator expects either the first digit
of a number or another Menu/CD press (to change operator), the previous result will be
cleared (CA, Clear All).
Another press of Cancel/* in either situation above will quit to the Hijack menu.
Examples of operation
12+5
enter 1 2 with the number keys, press Menu/CD to go to operator selection.
+ is the first choice (default), so now you can enter the 5. When you now press
Menu/CD the operation is carried out and the result, 17, is available for further
manipulation. If you want to start a new calculation (discarding the result) either repeatedly
press Menu/CD until the indicated operation is = or press Cancel/*.
Then enter the first number of the new calculation.
12*15
enter 1 2 with the number keys, repeatedly (3 times) press Menu/CD to
select the * operator.
Enter 1 5 with the number keys, press Menu/CD to carry out the operation.
If you want to start a new calculation (discarding the result) either repeatedly press Menu/CD
until the indicated operation is = or press Cancel/*. Then enter the first number of
the new calculation.
(5+10-32)/5
enter 5 with the number keys, press Menu/CD once to select addition
enter 1 0 with the number keys, press Menu/CD twice to select subtraction (15
is displayed)
enter 3 2 with the number keys, press Menu/CD 4 times to select division
(-17 is displayed)
enter 5 with the number keys, Press Menu/CD (-3 is displayed, fractions are truncated)
If you want to start a new calculation (discarding the result) either repeatedly press Menu/CD
until the indicated operation is = or press Cancel/*. Then enter the first number of
the new calculation.
(5+10)-32%5
This would have to be entered in a different order, to make the calculations in the correct priority
order.
Press Menu/CD twice to select the - operator, enter 3 2 with the number
keys
press Menu/CD 5 times to select the % operator
enter 5 with the number keys (-2 is displayed)
+ is now selected (default), enter 5, press Menu/CD (3 is displayed)
+ is now selected (default), enter 1 0 with the number keys, press
Menu/CD (13 is displayed)
Continued operation on a result
If you wish to continue operating on a result (let's say multiplying 20 to the result of the last
example, (5+10)-32%5, above; do not select = and then press Menu/CD.
Don't press Cancel/* either.
Instead just press Menu/CD another 2 times to select the * operator and then enter
2 0 with the number keys and then press Menu/CD to perform the multiplication
(260 is displayed)