Can C program run without main function?

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.

Why main function is not declared in C programming?

So the main() function is declared for you in the C compiler however you have to provide the actual definition of the function. Since main() is an external label there can only be one function called main() that you define.

Why does C require a main function?

7 Answers. By default, gcc (and most C compilers) compile and link to a standalone executable. The main() function is required so that the startup code knows where execution of your code should start. To compile your library code without linking, use gcc -c graph.

Is it possible to call any function from outside of the main function in C programming?

main() is the first function to be called by OS, and the execution of the program ends with closing braces of main(). However, as Kapil Jain has told, we can definitely call a function from some other function, given that this function has been called by main(), directly or indirectly!

What is main () Can we write a program without main ()?

The answer is yes. We can write program, that has no main() function. In many places, we have seen that the main() is the entry point of a program execution. Just from the programmers perspective this is true.

Why Main is called user defined function?

main() function is a user defined, body of the function is defined by the programmer or we can say main() is programmer/user implemented function, whose prototype is predefined in the compiler. Hence we can say that main() in c programming is user defined as well as predefined because it’s prototype is predefined.

How is main function called in C?

In ‘C’, the “main” function is called by the operating system when the user runs the program and it is treated the same way as every function, it has a return type. Although you can call the main() function within itself and it is called recursion.

Why is the main function so important?

The main function serves as the starting point for program execution. It usually controls program execution by directing the calls to other functions in the program. A program usually stops executing at the end of main, although it can terminate at other points in the program for a variety of reasons.