sstream

sstream用法

 #include<iostream>
 #include<sstream>
 #include<string>
 using namespace std;

 int main(){
     /* istringstream 用法 */
     istringstream instr;
     string str = "westerDB 1024";
     instr.str(str);    //只能存string值
     //instr.str(to_string(123));
     //cout<<instr.str()<<instr.str();    //并不会影响instr的内部内容

     string hdisk;
     instr>>hdisk;
     //getline(instr, hdisk);
     int cap;
     instr>>cap;

     //cout<<instr.str();
     cout<<hdisk<<endl<<cap;
     return ;
 }

 /* ostringstream用法 */
 int testOutStr(){
     ostringstream outstr;
     /*istringstream instr;
     string str = "westerDB 1024";
     instr.str(str);*/

     string hdisk;
     cout<<"what's the name of your hard disk?";
     getline(cin, hdisk);

     int cap;
     cout<<"what's its capacity in GB?";
     cin>>cap;

     outstr<< "The hard disk "<<hdisk<<" has a capacity of "
         <<cap<<" gigabytes.\n";

     string result = outstr.str();
     cout<<result;
     return ;
 }