Empty string: Difference between revisions

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$.

<lang futurebasic>

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>