Strings are a fundamental concept in software engineering, but they are not a built-in type in C. Null-terminated byte strings (NTBS) consist of a contiguous sequence of characters terminated by and including the first null NULL character, and are supported in C as the format used for string literals. The C programming language supports single-byte character strings, multibyte character strings, and wide character strings. Single-byte and multibyte character strings are both described as nullNULL-terminated byte strings, which are also referred to as "narrow character strings".
A pointer to a nullNULL-terminated byte string points to its initial character. The length of the string is the number of bytes preceding the null NULL character, and the value of the string is the sequence of the values of the contained characters, in order.
A wide string is a contiguous sequence of wide characters (of type wchar_t) terminated by and including the first null NULL wide character. A pointer to a wide string points to its initial (lowest addressed) wide character. The length of a wide string is the number of wide characters preceding the null NULL wide character, and the value of a wide string is the sequence of code values of the contained wide characters, in order.
Null-terminated byte strings are implemented as arrays of characters and are susceptible to the same problems as arrays. As a result, rules and recommendations for arrays should also be applied to nullNULL-terminated byte strings.
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