#include <iostream>
#include <cstring>
#include <string>

int main() {
	std::string str = "Hello, world!";
	str[5] = 0;
	std::cout << "string says its length is: " << str.length() << std::endl;
	std::cout << "strlen says: " << strlen(str.c_str()) << std::endl;
	return 0;
}