C / C ++中的C字符串定义

Question

What really means by word "C-string" in C / C++? Pointer to char? Array of characters? Or maybe const-pointer / const array of characters?

Answer 1

A "C string" is an array of characters that ends with a 0 (null character) byte. The array, not any pointer, is the string . Thus, any terminal subarray of a C string is also a C string. Pointers of type char * (or const char * , etc.) are often thought of as pointers to strings, but they're actually pointers to an element of a string, usually treated as a pointer to the initial element of a string.

Answer 2

Const or non-const array of characters, terminated by a trailing 0 char. So all of the following are C strings:

char string_one[] = { 'H', 'e', 'l', 'l', 'o', 0 };
char string_two[] = "Hello"; // trailing 0 is automagically inserted by the compiler
const char *string_three = "Hello";

Answer 3

A C-string is a series of characters that is terminated by a 0 byte, otherwise known as a null terminated string . It can be accessed either as an array ( char[] ) or as a pointer to the first character ( char * ).

In C++ there is another type of string called std::string which does not need to be terminated by a 0 byte. The term C-string is often used by C++ programmers when they mean a null terminated string rather than the std::string type.

Answer 4

根据标准（C11§7.1.1）， 字符串是由第一个空字符终止并包括第一个空字符的连续字符序列， 即由'\\0'终止的字符数组。