Include Header Document For Free

Yes, you can use #include<bits/stdc++. h> This header file includes all the standard header files. The only problem is, it would include a lot of unnecessary files which you don't require for a program, and also, since it includes a lot of header files your compilation time will increase.

Data within a file that contains identifying information about the file and possibly metadata with information about the file contents.

The header file eliminates the labor of finding and changing all the copies as well as the risk that a failure to find one copy will result in inconsistencies within a program. In C, the usual convention is to give header files names that end with . h .

The .h is the extension of the header files in C and we request to use a header file in our program by including it with the C preprocessing directive ?#include?. C language has numerous libraries that include predefined functions to make programming easier.

A TL;DR definition: A header file must include the header files that directly define each of the types directly used in or that directly declare each of the functions used in the header file in question, but must not include anything else.

The answer is : (D) Template Definitions.

A header file is a file containing C declarations and macro definitions (see Macros) to be shared between several source files. You request the use of a header file in your program by including it, with the C preprocessing directive ' #include '.

You make the declarations in a header file, then use the #include directive in every . cpp file or other header file that requires that declaration. The #include directive inserts a copy of the header file directly into the . cpp file prior to compilation.