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;}
推荐教程：c语言教程
以上就是c++中string类的常用方法有哪些的详细内容。