The C + + header files Standard C + + : #include "Iostream.h> Int main () { } Why not translated, and if it changed to the "can be translated through iostream>. Since the provision of iostream.h, how to use? Iostream.h this manner inconsistent with the standards. Used [code]#include "Iostream.h>[/code] Equivalent [code]#include "Iostream> Using namespace std; [/code] More generally recommend the use of the latter --> Does not mean? ? ? ? In the document Zhaobu to iostream.h, only iostream --> This is absolutely correct. #include "Iostream.h> C + + is a new version of the style. #include "Iostream> Using namespace std; After the standardization of C + + style. Many do not support the former compiler. "C + + Programming Language" Appendix B.3 China is devoted to "deal with the old C + +." Agree Good, and I summarize : 1. I dev c++4.9.8.0 test passed. 2. The new compiler may contain "iostream.h> the first such document is compatible to the old code, and the" iostream.h> Std : : China is not a function of the content. 3. The standard C + +, using the format : "iostream>, this is not the first paper (header file) Instead, the first (header), which is the standard name space. 4. "Iostream> totally dependent on the content of the" iostream.h> the content. Can be used alone. 5. Now the latest compiler only supports the "iostream> not support" iostream.h>. I understand, right? [ Closed window ]