Chapter 2: Main Application
43
• The example calculations are all performed using the Decimal mode (see page 44).
Using the
e
Key
Use the
e
key to input exponential values. You can also input exponential values using the
E
key on the
soft keyboard [Number] key set.
0202
Calculation
examples
Omitting the Multiplication Sign
You can omit the multiplication sign in any of the following cases.
• In front of a function… 2sin (30), 10log (1.2), etc.
• In front of a constant or variable… a
π
, 2ab, 3ans, etc.
• In front of an open parenthesis… 3(5 + 6), (a + 1)(b – 1), etc.
Note that you must use a multiplication sign when the expression directly in front of the open parenthesis is a
literal variable. Example: ab (3 + b) must be written ab × (3 + b). Otherwise, your input is considered to be in
function notation (
f
(
x
)).
• In front of the
e
key or
E
key (See “Using the
e
Key” above.)
• In front of a matrix or list… a {1, 2, 3}, 3 [[1, 2] [3, 4]], etc.
Using the Answer Variable (ans)
Any time you execute a calculation in the Main application work area, the last result is assigned automatically
to a variable named “ans” (answer). You can even recall current “ans” variable contents and input them into
another calculation by tapping the
D
key on the soft keyboard.
0203
Calculation
examples
Tip:
Starting a calculation expression with +, −, ×, ÷, or ^ operator will cause the “ans” variable to be inserted automatically
to the left of the operator, even if you do not tap the
D
key.
Assigning a Value to a Variable
Besides using the variable assignment key (
W
, page 31), you can also use the syntax shown below in the Main
application and eActivity application to assign a value to a variable.
Syntax:
Variable: = value
0204
Assign 123 to variable
x
Important!
“:=” can be used only in Main and eActivity. It can NOT be used in a program. In the Program application, you
must use
W
to store a value to a variable.
