HP HP-65 - Functions of x and the Exponential Function (y^x)

From a program, you use the function which changes the
sign, if negative. For example, calculate the absolute value of 3
and —3.
Press See Displayed Comment
3@ T |+3]
cHs X
B (=3 | 3.00 | |—3]
Functions of x and the Exponential Function (y*)
These functions are listed in Figure 3-3. They all leave the
result in the X-register. All expect an input value to be in the
X-register. expects, in addition, a y value in the Y-register.
It is worth noting that the conditions given for INPUT VAL-
UE(S) can generally be predicted by common sense. For exam-
ple, the table tells us that to calculate the reciprocal, the input
value cannot be 0, which is exactly what we would expect be-
cause we ordinarily attach no meaning to 1+0. If we attempt
to calculate the reciprocal of zero, the blinking display em-
phatically warns us of the error. Try it. Just press ‘cLx & [14 -
You can stop the blinking by pressing any key.
Sample Case: Common Logarithm. Calculate the power gain in
decibels of an amplifier yielding twice the value of the input
power.
Note: decibels =10 log (2)
Press See Displayed Comment
10 ENTER4 10.00 Save value 10.
2 @ FEE Log?2.
X - Answer.