The functions MAXR
symbolic constants for the largest and smallest positive real numbers
representable on the HP-28S. (To force a numerical result for a sym-
bolic constant, see HUsing
on page 74.)
This section shows you how to use the function NEG. For conve-
nience, you can execute NEG by pressing [
command line is present. To enter the NEG command in the com-
mand line-for example, when you're keying in a program-press
or [ill ] @].
Now negate the number in level 1 twice, once by pressing [
once by pressing
Negate the number in level
Negate the number a second time.
Defining New Functions
You can create program variables that work like the built-in func-
tions-you can even use them in expressions. Such program variables,
must fulfill two requirements:
• They must explicitly indicate their arguments .
• They must return exactly one result.
5: Real-Number Functions