【C++】string 和 int 的相互转化

使用stringstream类（头文件：sstream）

    1）string转为int

        #include<iostream>
        #include<sstream>
        #include<typeinfo>
        using namespace std;
        int main()
        {
        string s = "123456";
        int result = 0;
        stringstream stream(s);
        stream2 >> result;
        cout<< result<<endl;
        return 0;

}

    2）int转为string    
        #include<iostream>
        #include<sstream>
        using namespace std;
        int main()
        {
        string s;
        int result = 123456;
        stringstream stream;
        stream << result;
        stream >> s;
        cout<< s <<endl;
        return 0;
          }