Apple IIe - Page 76

76 Apple Ile Users Handbook
100 X = 100- 7 * SQR(49)
In an expression containing functions as well as arithmetic,
relational, and/or Boolean operators, the function's value is
calculated first. In our preceding example, the square root of 49
would be calculated, that value would be multiplied by 7, and
the product subtracted from 100.
Applesoft BASIC also includes a number of functions for
performing operations on strings. These include:
LEFT$
MID$
RIGHT$
These
functions can be used to extract one or more characters
from ,a string.
The various
Applesoft BASIC functions are described in Chapter
4.
String Concatenation
The addition operator (+) can be used to JOln together or
concatenate two strings. When concatenating strings, re-
member that the maximum length of a string in Applesoft BASIC
is 255 characters.
The
following program illustrates string concatenation.
100 A$= "JOHN"
200 B$ ="BILL"
300 C$ = A$ + B$ \
400 PRINT C$
500 END
RUN
JOHNBILL
The
subtraction operator (-) cannot be used to separate a
portion of a string.