Empty string: Difference between revisions

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With F90, compound data aggregates can be defined and as well procedures for operating on them, so that, after a great deal of syntactic struggle, a string data type will be available. F2000 standardised one such scheme whereby character variables are de-allocated and re-allocated with usage so that a statement such as <code>TEXT = "This" // "That"</code> would cause a de-allocation of whatever storage had been associated with TEXT followed by a re-allocation of storage for eight characters, the required size, and LEN(TEXT) would give 8.

=={{header|FutureBasic}}==

FB has several ways to determine string length as demonstrated below.

Note: The length -- or number of characters -- of a Pascal string in FB is stored in the first element of the string array. Here the string is dimensioned a s, hence s[0] contains the length of the string, and any individual character in the string can be found using s[i], where i is the position of the character. This makes iterating over the individual characters in a string easier than using functions such as instr or mid$.

include "ConsoleWindow"

dim as Str255 s

s = ""

if s == "" then print "String is empty"

if s[0] == 0 then print "String is empty"

if len(s) == 0 then print "String is empty"

s = "Hello"

if s <> "" then print "String not empty."

if s[0] then print "String not empty."

if len(s) > 0 then print "String not empty."

</lang>

=={{header|Go}}==