Is it possible to execute C program without any function?

But in reality it runs with a hidden main function. The ‘##’ operator is called the token pasting or token merging operator. So actually C program can never run without a main() . We are just disguising the main() with the preprocessor, but actually there exists a hidden main function in the program.

Can we run C program successfully without including header files?

So, in short, the answer is yes. We can compile C program without header file.

What happens if we don’t use header files in C?

You can’t use any of the macros defined in the headers. This can be significant. The compiler can’t check that you are calling functions properly since the headers define their parameters for it.

Is program executed without main function () or not?

No you cannot unless you are writing a program in a freestanding environment (embedded environment OS kernel etc.) where the starting point need not be main() . As per the C++ standard main() is the starting point of any program in a hosted environment .

Is header file necessary in c?

No, it’s not always necessary to add header files . Header files is a package of predefined functions or programs which are already made and stored in our c or c++ applications.

Why are header files important in c?

The main role of header file is it is used to share information among various files.To put it brief, if we have several functions say 4 functions named as f1, f2, f3, f4 placed in file say sample. c and if all the functions want to get accessed each other all must be placed in the same file sample. c.

Is it necessary to include header file?

Your own header files contain declarations for interfaces between the source files of your program. Each time you have a group of related declarations and macro definitions all or most of which are needed in several different source files, it is a good idea to create a header file for them.