Как посчитать количество символов в строке на C++?

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#include <iostream>
#include <string>

using namespace std;

int main() {
	string line = "Hello, this is just line";
	string word = "Car";

	cout << "In line " << line << " " << line.length() << " symbols" << endl; // Вывод : "In line Hello, this is just line 24 symbols"
	cout << "In word " << word << " " << word.length() << " symbols" << endl; // Вывод : "In word Car 3 symbols"

	return 0;
}

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#include <iostream>
#include <cstring>

int main() {
    std::string str = "Hello, world!";
    std::cout << "Length: " << strlen(str.c_str()) << std::endl;
    return 0;
}

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std::string str = "Hello, world!";
std::cout << "Length: " << str.length() << std::endl;