Remote-processing BASIC 52 Manuale Utente Scaricare il pdf (Pagina 19)

RPBASIC-52 PROGRAMMING GUIDE

1-16

String operation

ASC

CHR

STR

STRING

Strings in RPBASIC-52 are one-dimensional arrays

of characters. Strings are stored as a sequence of

ASCII values terminated with a 0D H (the ASCII

value of a carriage return).

Memory for strings is allocated by the STRING

operator. String varia bles ar e $(0) th rough $(254).

Strings may be any length, lim ited only by available

memory. However, if you wish to assign a string to

explicit text in quotes, it may be up to

[72-{number of digits in string identifier}]

characters in length. In other words, $(9) may be 71

characters long, but $(200) may be only 69

characters long. This is due to the BASIC-52

program line length limit of 79 characters. Longer

strings must be assigned one character at a time with

the ASC operator or the X BY instruction. Explicit

text assigned to a string must be enclosed in double

quotation marks. The ASC and CHR operators can

evaluate individual characters in a string.

Interrupts

ON COM$

ON COUNT

ONITR

ON KEYPAD

ON LINE

ONTICK

RETI

Other operators

IDLE

Memory Allocation

FREE

LEN

MTOP

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 162 163

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Remote-processing BASIC 52 Manuale Utente Pagina 19