Web Reference: Jul 11, 2025 · The length of a string is the number of characters in it without including the null character (‘\0’). In this article, we will learn how to find the length of a string in C. The built-in C strlen () function counts the total number of characters in a given string, excluding the null terminator (\0). In short, the strlen () function accepts a string argument, finds its length, and returns an unsigned integer type. The C strlen () function is defined in the header file, so we must include this file before the main program. The strlen () function returns ... C strlen () The strlen() function takes a string as an argument and returns its length. The returned value is of type size_t (an unsigned integer type). It is defined in the header file.
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