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104
ZIP4x4 User’s Manual
The software puts each number on a separate line, preceded by the arithmetic operator. If you
enter multiple arithmetic functions, the software scrolls the numbers off the top of the display.
You can scroll the display by using the Up and Down buttons.
As you perform multiple calculations, the ZIP4x4 remembers what you typed so that you can
scroll back. The phone remembers and can display 32 lines.
8.9.4
Order of Operations
If you use multiple operators, the calculator performs multiplications and divisions first then
additions and subtractions. Therefore:
2 + 3 X 4 = 14
and:
2 X 3 + 4 X 5 = 26
A calculator that displays a single number might evaluate the calculations as 20 and 50
respectively. If you want the calculator to make a calculation with each operator, use the = key
to force the calculation, as in the following example:
1 + 2 ÷ 3 = 1.666667
1 + 2 = 3 ÷ 3 = 1
8.9.5
Divide by Zero
If you divide a number by zero, the phone displays the symbol for infinity. For example:
8.9.6
Editing
You can edit your entries by using the volume keys in a similar manner to that described in section
8.2.7 on page 78. When you edit your entry, you can change the arithmetic operator. Use the Up
and Down buttons to move between the lines.
After you have made the changes, it is not necessary for you to return the cursor to the last
position. You can press the = button to see the result. The software displays the last line and the
result of the equation.
8.9.7
Clearing
You can clear the current entry by pressing the # key. The small ‘C’ on that key indicates
Clear
. If
you most recently entered a number, the phone clears the entire number. If you most recently
entered an arithmetic operator, the phone clears the operator. As you continue to press the Clear
key, the phone deletes numbers or arithmetic operators that you have entered.
You can clear all numbers and arithmetic operators that you have entered by pressing the Func
key. The small letters ‘AC’ on that key indicate
All Clear
.
1
÷ 0
= æ
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