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Entering and Evaluating Equations
6–13
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
To change the number, type the new number and press
¥
. This new
number writes over the old value in the X–register. You can enter a number as
a fraction if you want. If you need to calculate a number, use normal
keyboard calculations, then press
¥
. For example, you can press 2
Ï
5
)
¥
.
To calculate with the displayed number, press
Ï
before
typing another number.
To cancel the prompt, press
Å
. The current value for the variable
remains in the X–register. If you press
Å
during digit entry, it clears the
number to zero. Press
Å
again to cancel the prompt.
To display digits hidden by the prompt, press
º
Î
.
Each prompt puts the variable value in the X–register and disables stack lift. If
you type a number at the prompt, it replaces the value in the X–register. When you
press
¥
, stack lift is enabled, so the value is retained on the stack.
The Syntax of Equations
Equations follow certain conventions that determine how they're evaluated:
How operators interact.
What functions are valid in equations.
How equations are checked for syntax errors.
Operator Precedence
Operators in an equation are processed in a certain order that makes the
evaluation logical and predictable: