fx-82MS fx-82TL fx-9860GII
AC
On a Casio calculator you can clear all data on the display
AC
and the keyboard is unlocked.
Error messages
Your calculator is locked while an error message is on the display. Press AC to clear the error. Press left < or right > to display the calculation and correct the problem. Pressing AC does not clear replay memory, so you can recall the last calculation.
Example 1
To enter 1 ÷ 0
1 ÷ 0 = Math ERROR
AC
Dividing by zero always produces a message.
Example 2
To enter 00
0 ^ 0 = Math ERROR
AC
although it is determined by definition that 00 ≝ 1. Take that as a warning.
Example 3
A negative sign cannot be used to perform a subtraction
2 (−) 1 2-1_
0.= Syntax ERROR
AC