Atari XL User Manual

Pieces of Strings
30 PRINT A$
55
This converts the single number 12345 into a
string by assigning the characters 12345 to A$ and
displays the string.
The complementary function to STR$ is VA L.
V AL evaluates the numerical characters in a
string:
10 DIM A$ (10)
20 A$ = "123456"
30 A = VAL(A$)
40 PRINT A
This displays the number (123456'.
If the string evaluated contains letters as well as
numbers then only the numbers which appear to
the left of all the letters are converted by VA L.
This means that '
PRINT VAL(n123ABC45")
displays (123'.
The signs + and - may appear before the number
characters. They will be treated by V AL as the
sign of the number. If the first characters of the
string are not numeric the message ERROR-18 is
displayed by the Atari.
TESTING STRINGS
Strings can be compared wi th each other ,in the
same way as numbers, using IF ... THEN. A
routine like this one can be used to check that an
entry is suitable for the program:
10 DIM PW$(50)

Atari XL Specifications

General

Release Year	1983
CPU	MOS Technology 6502C
Graphics	ANTIC, GTIA
Sound	POKEY (4 channels)
Storage	Cassette tape
Ports	Cartridge
Operating System	Atari BASIC
CPU Speed	1.79 MHz
RAM	64 KB