ostrstream example

 #include  <iostream>
 #include  <iomanip>
 #include  <strstream>
 #include  <string>
 int  main()  {
         char  a[14]  =  "";
         ostrstream  os(a,  14);
         os  <<  setw(12)  <<  setfill('*')
                                       <<  42.12  <<  endl;
         string  s(a);    cout  <<  s;
 }