1 #include 
     
       2 #include 
      
        3 #include 
       
         4 using namespace std; 5 int string2int(string str){ 6     int num; 7     stringstream sstream; 8     sstream << str; 9     sstream >> num;10     return num;11 }12 string int2string(int num){13     string re;14     stringstream sstream;15     sstream << num;16     return sstream.str();17 }