HP 17bII 273

X d @c 0.00

Because of the automatic movement of the stack, it is not necessary to clear the stack before starting a calculation. Note that if an application menu is currently displayed, pressing @c also clears the application’s variables.

The LAST X Register

Retrieving Numbers from LAST X

The LAST X register is a companion to the stack: It stores the number that had been in the X-register just before the last numeric operation (such as

a*operation). Pressing @Lreturns this value to the X-register. This ability to recall the “last x” value has two main uses:

!Correcting errors: retrieving a number that was in the X-register just before an incorrect calculation.

!Reusing a number in a calculation.

Reusing Numbers

You can use @L to reuse a number (such as a constant) in a calculation. Remember to enter the constant second, just before executing the arithmetic operation, so that the constant is the last number in the X-register, and therefore can be saved and retrieved with @L.