Commodore 128 System Manual page 334

EXAMPLE:
PRINT ERR$(10)
NEXT WITHOUT FOR
EXP
Return value of an approximation of e (2.7182813) raised to the
power X
EXP(X)
This function returns a value of e (2.7182813) raised to the power
X.
EXAMPLE:
PRINT EXP(1)
2.7182813
FNxx
Return value from user defined function
FNxx(X)
This function returns the value from the user-defined function xx
created in a DEF FNxx statement.
EXAMPLE:
10 DEF FNAA(X)=(X-32)*5/9
20 INPUT X
30 PRINT FNAA(X)
RUN
? 40 (? is input prompt)
4.44444445
FRE
Return number of available bytes in memory
FRE (X)
Where X is the bank number. X=0 BASIC program storage and
X=1 to check for available BASIC variable storage.
18-6