C++-字符串(string)

/*
字符串演示
*/
#include <iostream>
#include <cstring>
using namespace std; 


int main(void) {
    string s = "hello"; 
    s += " world"; 
    cout << s << endl; 
    
    string s2; 
    s2 = s;
    cout << s << endl; 
    //进行比较 
    string s3 = "hello world"; 

    if (s == s3) {
        cout << "两个字符串内容相同" << endl; 
    }
    cout << s.size() << endl;
    cout << s.length() << endl; 
    cout << strlen(s.c_str()) << endl;  
}