What is the end mark of a string?

The end mark of the string is "′\0′". In order to determine the actual length of the string, C specifies a "string end flag", represented by the character "'\0'"; in programs, it is often relied on detecting the position of "'\0'" to determine whether the string ends. Rather than determining the string length based on the length of the array.

The end flag of the string is '\0'.

In order to determine the actual length of a string, C specifies a "string end flag", represented by the character '\0'. In the above array, the 11th character is '\0', which indicates that the valid characters of the string are the previous 10 characters. In other words, when the character '\0' is encountered, it means that the string ends here, and the characters before it form a string.

Extended information:

For a string constant, the system will automatically add a '\0' after all characters as a terminator. For example, the string "I am happy" has a total of 10 characters, but it occupies a total of 11 bytes in the memory. The last byte '\0' is automatically added by the system.

In programs, we often rely on detecting the position of '\0' to determine whether the string ends, rather than determining the string length based on the length of the array. Of course, the actual string length should be estimated when defining the character array to ensure that the array length is always greater than the actual string length. If multiple strings of different lengths are stored in a character array, the length of the array should be greater than the length of the longest string.

Recommended tutorial: "C Language"

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