C++ STL库 string类型常见操作

#include 
using namespace std;
int main() {
    
    string s = "Hello World!";

    
    

    
    cout << s << endl; 

    
    for (int i = 0; i < s.length(); i++)
        printf("%c", s[i]);
    printf("n");
    

    
    printf("%sn", s.c_str());
    

    
    
    
    cout << s << endl; 
    s.insert(0, "HDU, "); 
    cout << s << endl; 
    
    
    
    
    cout << s << endl; 
    s.erase(10, 6); 
    cout << s << endl; 

    
    
    
    
    cout << s << endl; 
    cout << s.substr(5, 6) << endl; 
    cout << s << endl; 

    
    
    
    
    
    cout << s << endl; 
    string str = "ello";
    cout << s.find("ello") << endl; 
    cout << s.find(str) << endl; 
    str = str + "1"; 
    if (s.find(str) == string::npos) {
        printf("Not Foundn");
    }
    

    
    
    
    
    cout << s << endl; 
    cout << s.replace(5, 5, "World") << endl; 
    cout << s << endl; 
    
    return 0;
}

参考文献：《算法笔记》 胡凡 曾磊 著