c++中string类的常用方法如下: 1、获取字符串长度 #includecstdio#includeiostream#includestringusing 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
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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