STL之string

#include<iostream>
#include<vector>
#include<algorithm>//常用算法头文件
using namespace std;

//string与char*的相互转换
void test03(){
    //string转为char*
    string str="1111";
    const char* s=str.c_str();
    cout<<s<<endl;

    //char*转为string
    const char* ss="1111";
    string sstr=s;
    cout<<sstr<<endl;
}

//拼接操作
void test04(){
    string s="abcd";
    string s2="111";
    s+="abcd";
    s+=s2;

    cout<<s2<<endl;

    string s3="2222";
    s2.append(s3);
    cout<<s2<<endl;


}

//查找操作
void test05(){
    string s="abcdefghifgjk";
    int pos =s.rfind("fg");
    cout<<"pos:"<<pos<<endl;
}

//替换操作
void test06(){
    string s="abcdefg";
    s.replace(0,2,"111");
    cout<<s;
}

//比较操作
void test07(){
    string s1="abcd";
    string s2="abce";
    if(s1.compare(s2)==0){
        cout<<"字符串相等"<<endl;
    }
    else{
        cout<<"字符串不相等"<<endl;
    }
}


//截取字符串
void test08(){
    string s="abcdefg";
    string substring_s=s.substr(2,3);
    //从第二个位置开始，截取三个字符
    cout<<substring_s<<endl;
}

//插入和删除
void test09(){
    string s="abcdefg";
    s.insert(3,"111");
    cout<<s<<endl;
    s.erase(0,2);
    cout<<s<<endl;

}


int main()
{

    test09();

    return 0;
}