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;
}