The meaning of strlength in c language

The strlen() function gets the length of the string, excluding the empty character '\0': 1. Calculate the number of characters without empty characters; 2. Iterate over the string until the empty character is found; 3. Return the length of the string, type size_t.

The meaning of strlen() in C language

strlen() is a standard library function in C language that gets the length of a string ending with the null character '\0'. It calculates the number of characters in the string that do not include null characters.

grammar

 <code class="c">size_t strlen(const char *str);</code>

parameter

• str : A character pointer to a string ending with the empty character '\0'.

Return value

strlen() Returns the length of the string, excluding empty characters. If the string is NULL, return 0.

Example usage

 <code class="c">char str[] = "Hello, world!"; int length = strlen(str); // length = 12 (不包括空字符)</code>

Detailed explanation

The strlen() function calculates the length of the string by traversing the string until the empty character '\0' is found. It does not modify the provided string.

Notice

• strlen() only applies to strings ending with the null character '\0'. For other types of strings, it can produce unexpected results.
• strlen() returns an integer of type size_t , which is an unsigned integer type used to store the length of the string.
• strlen() has a time complexity of O(n), where n is the length of the string.

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