c++ - problem with calling libraries -

hi i'm watching c++ tutorial , instructor includes libraries

# include  "map.h" #include "set.h" 

but when use code error

fatal error c1083: cannot open include file: 'set.h': no such file or directory

so have write

# include  <map> #include <set> 

but have problem when create set or map ob , methods can use different shown in tutorial example in tutorial instructor create , navigate set or map

set<int> ss; set<int>::itrator itr = ss.itrator(); while(itr.hasnext()){  cout<<itr.next(); } 

but ss , object doesn't have methods

ss.itrator(); itr.hasnext() itr.next(); 

an have write code

set<int> ss; set<int>::itrator itr = ss.begin(); while(!itr.end()){  cout<<*itr; } 

what problem ?

pretty obviously, tutorial doesn't use standard template library, , uses custom library of own. #include "set.h" looks set.h file in user search path, current directory. since don't have file, compiler emits error.

when #include <set>, stl set class. tutorial's "set.h" file probably give class (same goes <map> , "map.h").

anyhow, if you're following c++ tutorial, might try find 1 stl, since it's got wider support , adoption other c++ libraries. can follow 1 here.

the corresponding code snippet following:

set<int> ss; (set<int>::iterator itr = ss.begin(); itr != ss.end(); itr++) {     cout << *itr; } 

instead of ss.iterator(), have ss.begin(), returns iterator positioned "beginning" of set. instead of itr.hasnext(), must compare itr ss.end(); ss.end() returns iterator positioned "end" of set, know you're not done iterating while iterator not same iterator positioned end of collection. itr++ , *itr take place of itr.next().

in context, itr.next() both returns current element , advances iterator one. bad design because object provides no means access current element, leading duplicate code if want access current element multiple times. stl iterators have distinct operations advancing , obtaining referenced element: itr++ advances iterator, , *itr obtains current element.