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FutureBasic 5
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mid$ and mid$$
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statement
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Syntax:
mid$(PascalStringVar,startPos,numChars) = replacePascalString
mid$$(container$$,startPos,numChars) = ¬
replacePascalString/contnr$$
Description:
This statement updates PascalStringVar
(which must be a string variable) or container$$
(a container variable), deleting a subpart from PascalStringVar
or container$$
and replacing it with an equal number of characters from the left side of replacePascalString
. The subpart to be replaced begins at position startPos
within PascalStringVar
or container$$
. In the following code fragments, containers and strings work the same. The number of characters replaced equals the smallest of these quantities:
numChars
len(replacePascalString)
len(PascalStringVar) - startPos + 1
Under the following circumstances, mid$
does nothing:
- When
PascalStringVar
or replacePascalString
is empty;
- When
startPos
is less than 1 or greater than len(PascalStringVar)
;
- When
numChars
is less than 1.
Note:
You may not use complex expressions that include containers on the right side of the equal sign.
Example:
x$ = "abcdefgh"
y$ = "abcdefgh"
z$ = "abcdefgh"
mid$(x$,2,3) = "1234"
print x$
mid$(y$,2,5) = "1234"
print y$
mid$(z$,7,4) = "1234"
print z$
program output:
a123efgh
a1234egh
abcdef12
See Also:
mid$ function; left$; right$; instr