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{{see also|String (computer science)#Null-terminated}}
{{Use dmy dates|date=August 2021}}
In [[computer programming]], a '''null-terminated string''' is a [[character string]] stored as an [[Array data structure|array]] containing the characters and terminated with a [[null character]] (a character with a value of zero, called NUL in this article). Alternative names are '''[[C string]]''', which refers to the [[C (programming language)|C programming language]] and '''ASCIIZ'''{{citation needed|date=November 2021}} (although C can use encodings other than ASCII).
The length of a string is found by searching for the (first) NUL. This can be slow as it takes O(''n'') ([[linear time]]) with respect to the string length. It also means that a string cannot contain a NUL (there is a NUL in memory, but it is after the last character, not "in" the string).
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