參數(shù)資料
型號： NSB8
廠商： Electronic Theatre Controls, Inc.
英文描述： BASIC interpreter for Z80 family
中文描述： Z80的BASIC解釋為家庭
文件頁數(shù)： 125/158頁
文件大?。?/td> 752K
代理商： NSB8
ITALIAN TECHNOLOGY
grifo
Page 113
NSB8 Rel. 5.10
COMPATIBILITY WITH OTHER BASICS
This section provides some information which may be useful to you if you are attempting to convert
programs into
NSB8
from other versions of BASIC.
STRING HANDLING
The operations and functions used to access strings and substrings often differ widely between
different versions of the BASIC language. Section USING STRINGS details the system implemented
in
NSB8
, where substring access is achieved through string name subscripting. However, some
BASIC systems use the so called “mid left right” convention, where access to substrings is made
possible by the three built in string functions MID$, LEFT$, and RIGHT$. Programs which use this
method of substring access will have to be modified to reflect
NSB8
conventions. In general:
OTHER BASICS
LEFT$(X$,L)
RIGHT$(X$,R)
MID$(X$,L,N)
NSB8
X$(1,L)
X$(LEN(X$)-R+1)
X$(L,L+N-1)
is the same as
is the same as
is the same as
ARRAY OF STRINGS
Some versions of BASIC implement arrays of strings with the syntax which is used for substring
referencing in
NSB8
. An array of strings may be achieved in
NSB8
by partitioning a string variable
into fixed length substrings. For example, an array of N strings, each of maximum length L would
be dimensioned as:
10 DIM A$(N*L)
and the J
th
string element (where J extends from 0 to N-1) would be accessed using:
A$(J*L+1,(J+1)*L)
STRING DECLARATIONS
In
NSB8
, all strings longer than 10 characters must be explicitly declared in a program’s dimension
statements. Strings may be dimensioned to any length desired, to the limit of available computer
memory. Some other BASICs do not require that string variables be dimensioned before use, but may
set a small upper limit on the maximum length of strings which may be used in a program.
INPUT TRANSLATION
Certain characters, when they are typed into
NSB8
, are automatically translated into other
characters. This is done to help minimize the effort of converting programs written for other BASIC
systems into
NSB8
. This conversion is not performed upon text within quoted strings. The following
chart summarizes the translation process.
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