Commodore 128D - Page 326

HEX$
INSTR
EXAMPLE:
10 DEF FNAA(X)=(X-32)*5/9
20 INPUT X
30 PRINT FNAA(X)
RUN
? 40 (? is input prompt)
4.44444445
NOTE: If GRAPHIC is used in a program that defines a function, issue
the GRAPHIC command before defining the function, or else the
function definition is destroyed.
—Return number of available bytes in memory
FRE(X)
where X is the bank number. X = 0 to check BASIC program storage
and X = 1 to check for available BASIC variable storage.
EXAMPLES:
PRINT FRE (0) Returns the number of free bytes for BASIC
48893 programs.
PRINT FRE (1) Returns the number of free bytes for BASIC
64256 variable storage.
—Return hexadecimal number string from decimal number
HEX$(X)
This function returns a four-character string containing the hexadeci
mal representation of value X (0 < = X < = 65535). The decimal
counterpart of this function is DEC.
EXAMPLE:
PRINT HEX$(53280)
D020
—Return position of string 1 in string 2
INSTR (string 1, string 2 ^starting position])
The INSTR function searches for the first occurrence of string 2
within string 1, and returns the position within the string where the
match is found. The optional parameter for STARTING POSITION
establishes the position in string 1 where the search begins. The
STARTING POSITION must be in the range 1 through 255. If no
match is found or, if the STARTING POSITION is greater than the
length of string 1 or if string 1 is null, INSTR returns the value 0. If
318
BASIC 7.0 ENCYCLOPEDIA-Basic Functions