C++ String Length: size() vs length()

In C++, you can determine the length of a string by using the size() or length() methods of a string object. Example:

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello, World!";
    
    // 使用size()方法获取字符串长度
    std::cout << "Length of string (using size()): " << str.size() << std::endl;
    
    // 使用length()方法获取字符串长度
    std::cout << "Length of string (using length()): " << str.length() << std::endl;
    
    return 0;
}

The above code will produce:

Length of string (using size()): 13
Length of string (using length()): 13