iostream header include string header?

[keepinmind]

#include<iostream>
using namespace std;
int main()
{
      string a;
      while(cin>>a)
	    cout<<a<<endl;
      return 0;
}

I have not included the string header,but it works .It seems iostream include it

[Peter87]

Standard headers can include other headers so this is probably the case here. If you want to make sure it works on all compilers you have to include <string>.

[moorecm]

GNU's implementation, in particular, does include string in iostream but I believe the correct thing to do for portability is to include both explicitly.

[S6k9GNh0]

The same code won't compile on VC++. Especially with the standard headers, you generally want to explicitly include individual headers to maintain flexibility.

[keepinmind]

thank all very much