CALCULATOR PARTS

2.1. Display Window

There are three main components of the display:

1. Status line
2. History area
3. Input line

F12 key is the switch between different dimensions of the Calculator for Chemists. Use this option if you want to hide the calculators keyboard and show Display only.

Status line

Status line is displayed across the top of the screen. Each item on the status line is one of the following:

Number format

• AUTO mode displays number exactly as you enter them and goes up to 15 significant decimal places.
• SCI mode displays a number as a mantissa - with one digit to the left of the decimal point and the user-specified number of decimal places - and the exponent
• FIX mode displays numbers rounded to a user specified number of decimal places (default is 2)

Memory

• The MEM sign appears when a number is stored in the memory
• F6 key stores the new result in the memory
• F7 key recalls the value stored in the memory

Angle measure

Controls the units in which angular measurements are interpreted: radians, degrees or grads.

• RAD - The angle unit is set to radians
• DEG - The angle unit is set to degrees
• GRAD - The angle unit is set to grads

History area

The history area shows input data and answers to last two calculations. When the answer exceeds the normal display capacity, it is automatically shown in scientific notation with 15-digit mantissa and exponents of 10 up to ±308.

Input line

There are four ways to insert an expression onto the input line:

• Type the expression directly onto the input line
• Use an expression from the task history
• Load expression from the disk
• Use copy and paste an expression from other programs

To edit an existing expression, go on the input line, use the arrow keys to position the cursor where you want to insert the character, function or constant, and entering that.

When you have finished entering your expression, press ENTER or click = button.

All the expressions you create are stored on a scrolling list for later recall. Press the ∇ button to display the task history and you can scroll through the history. The last expression is placed on the top of the history.

If the first character in the expression is # that means it is a command. With such expressions it is possible to change the number format or the angle measurement. You must follow the #sci or #fix with digits (0-15) specifying the number of decimal places, e.g. enter #sci3 in the input line.

• #rad - set angle unit to radians
• #deg - set angle unit to degrees
• #grad - set angle unit to grads
• #auto - automatic mode for displaying numbers
• #sci - scientific mode for displaying numbers
• #sci12 - sets the display to scientific notation with twelve decimal places.
• #fix - fixed mode for displaying numbers
• #fix0 - sets the display to fixed decimal notation with zero decimal places.
• #dec15 - round number to 15 decimal places
• #dig - use space as thousands separator (0 = OFF, 1 = ON)
• #fun - use colon (:) as function separator (0 = OFF, 1 = ON)
• #dot - use dot (.) as decimal separator
• #comma - use comma (,) as decimal separator
• #mem - store previous result in the memory
• #mem+ - add previous result to number in the memory
• #mem- - subtract previous result from number in the memory

2+5-3.25 = 3.75
H2SO4 = 98.07848
5! = 120
log123 = 2.089905111439398
alog2.089905111439398 = 123
x^2 + x -2 = 0
x1 = -2
x2 = 1
Al(NO3)2+2H2O = 187.0218986
#fix3 = 187.022 = numbers rounded to three decimal places