C++ strlen Function: Purpose & Usage

In C++, the strlen function is used to calculate the length of a string, which returns the number of characters in the given string (excluding the null character ‘\0’). The prototype of the strlen function is as follows:

size_t strlen(const char* str);

It takes a C-style string with a null character at the end as a parameter and returns the length of the string. This function is commonly used to determine the length of a string for other operations, such as copying or comparing strings.