Web Reference: May 29, 2023 · The strlen () function in C calculates the length of a given string. The strlen () function is defined in string.h header file. It doesn't count the null character '\0'. The syntax of strlen () function in C is as follows: The strlen () function only takes a single parameter. str: It represents the string variable whose length we have to find. The strlen() function returns the length of a string, which is the number of characters up to the first null terminating character. This is smaller than the amount of memory that is reserved for the string, which can be measured using the sizeof operator instead. The built-in C strlen() function counts the total number of characters in a given string, excluding the null terminator (), or finds the length of a string.
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