c++字符串简单操作回顾

一、概述

　　案例：回顾string字符串相关操作。

二、代码示例

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#include <iostream> #include <string> #include <vector>   using namespace std;   void test(){     string str;     str = "luoluoyang";     str.assign("luoluoyang",3);     cout << str<<endl;     string str2;     str2.assign(str);     cout << str2<<endl;       str2.assign(str,0,2);     cout <<str2<<endl; }   void test1(){     //字符串拼接     string str1 = "luoluoyang ";     string str2 = "luoluoyang";     str1+=str2;     cout<<str1<<endl;     str1.append(" and tony son");     cout << str1<<endl;       //查找字符串     string str = "Today is another beautiful day";     int pos = str.find("is");     if(pos==-1){         cout << "str not found"<<endl;     }else{         cout << "str found is pos:"<<pos<<endl;     }       //替换     str.replace(1,5,"TTTTT");     cout<<str<<endl;       string str3 = "hello world";     string str4 = "hello world";     //比较操作     if(str4.compare(str3)==0){         cout << "equals"<<endl;     }else{         cout << "not equals"<<endl;     }       //查找子串     string strsub = str.substr(0,5);     cout << strsub<<endl;       //     string email = "tony@163.com";     int pos2 = email.find("@");     string posStr = email.substr(0,pos2);     cout << posStr<<endl;       cout << "-----------------"<<endl;     //解析字符串     string str5 = "www.baidu.compare";     vector<string> v;     int start = 0;     int pos3 = -1;     while(true){         pos3 = str5.find(".",start);         if(pos3==-1){             string tempstr = str5.substr(start,str5.size()-start);             v.push_back(tempstr);             break;         }         string tempstr = str5.substr(start,pos3-start);         v.push_back(tempstr);         start = pos3+1;     }     for(vector<string>::iterator it = v.begin();it!=v.end();it++){         cout << *it <<endl;     }         cout << "------------"<<endl;     //插入字符     string str6 = "luoluoyang";     str6.insert(0,"222");     cout << str6<<endl;       //删除字符     str6.erase(0,3);     cout <<str6<<endl;       //string和char *str相互转换     char *str7 = "tony";     string str8(str7);     cout <<str8<<endl;       string str9 = "kiki";     const char *str10 = str9.c_str();     cout << str10<<endl; }   int main(int argc, char const *argv[]) {           // test();     test1();     return 0; }