c++中string类的常用方法有哪些

c++中string类的常用方法如下：

1、获取字符串长度

 #include<cstdio>#include<iostream>#include<string>using namespace std;int main(){    string str1 = "hello";     int length = str1.length();    printf("调用str.length()函数获取字符串长度：%d\n\n",length );    return 0;}

2、字符串连接

 #include<cstdio>#include<iostream>#include<string>using namespace std;int main(){    string str1 = "hello";    string str2="my girl!";    string str3="hello ";     string str4=str1+str2;    string str5=str3+str2;    cout<<"字符串str1+str2连接结果："<<str4<<endl;    cout<<endl;    cout<<"字符串str3+str2连接结果："<<str5<<endl;    return 0;}

3、字符串比较

 #include<cstdio>#include<iostream>#include<string>using namespace std;int main(){    string str1 = "hello";    string str2="my girl!";    string str3="hello ";     if (str1 < str3)        cout << "字符串比较结果：" << "str1<str2" << endl;    cout << endl;    return 0;}

4、字符串转字符数组

 #include<cstdio>#include<iostream>#include<string>#include<cstring>using namespace std;int main(){    string str1 = "hello";    string str2="my girl!";    string str3="hello ";     char *d = new char[20];  //因为下一句那里不是直接赋值，所以指针类型可以不用const char *    strcpy(d, str3.c_str());  //c_str 取得C风格的const char* 字符串    cout << "str3:" << c << endl;    cout << "d:" << d << endl;    str3 = "hahaha";    cout << "str3:" << c << endl;    cout << "d:" << d << endl;    return 0;}

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