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</pre>
=={{header|X86-64 Assembly}}==
===UASM 2.52===
<lang asm>
option casemap:none
printf proto :qword, :VARARG
exit proto :dword
.data
e_str db 1 dup (0)
.code
main proc
xor rcx, rcx
lea rax, e_str
cmp byte ptr [rax+rcx],0 ;; Is e_str[0] equal to 0?
je _isempty ;; Yes so goto isEmpty
jne _notempty ;; No, got notEmpty
jmp _exit ;; Neither condition is met, so exit.
_isempty:
invoke printf, CSTR("e_str is empty",10)
lea rax, e_str
mov byte ptr [rax+0], 's' ;; Copy a char into e_str[0]
jmp main ;; Test again..
_notempty:
invoke printf, CSTR("e_str is NOT empty",10)
;; Fall though to exit here..
_exit:
xor rsi, rsi
call exit
ret
main endp
end
</lang>
{{out}}
<pre>
e_str is empty
e_str is NOT empty
</pre>
=={{header|XLISP}}==
<code>STRING-NULL?</code> returns true if its argument is a string of length zero. In a REPL:
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