What is about ANSI-C++?
Well Rachna! In ANSI-C++ the way to include header files from the standard library has changed. The standard specifies the following modification from the C way of including standard header files: Header file names no longer maintain the .h extension typical of the C language and of pre-standard C++ compilers, as in the case of stdio.h, stdlib.h, iostream.h, etc. This extension h simply disappears and files previously known as iostream.h become iostream (without .h). Header files that come from the C language now have to be preceded by a c character in order to distinguish them from the new C++ exclusive header files that have the same name. For example stdio.h becomes cstdio . All classes and functions defined in standard libraries are under the std namespace instead of being global. This not applies to C macros that remain as C macros. Here you have a list of the standard C++ header files:
