About Main function

Question

I want to know about main function
Is it user defined or predefined
As we want to call a function to run it then how main function runs without calling

Answer 1

@Ronak Read this 👇👇👇

http://en.cppreference.com/w/c/language/main_function

Answer 2

Jamie can you explain in deep how operating system call main function

Answer 3

Ronak,

The convention in the c family is that the main class is the entry point in the program.

An executable program is going to have many sections of code, you might have c, c++, assembly and others. it must have a starting address. when the c compiler sees "main" it tells the linker to use the stay off that class as the start of the program.

For example, in Linux you can use readelf to see the value of the _start symbol for an elf file.

HTH
Juan

Answer 4

https://www.sololearn.com/discuss/145188/?ref=app

look this one also

Answer 5

@jamie
no

Answer 6

When your program runs, the OS creat a process, and the main function is what the process doing. when the OS schedules to run the process, the main function is called.