With GCC family of C compilers, we can mark some functions to execute before and after main(). So some startup code can be executed before main() starts, and some cleanup code can be executed after main() ends. For example, in the following program, myStartupFun() is called before main() and myCleanupFun() is called after main().
startup code before main() hello cleanup code after main()
Like the above feature, GCC has added many other interesting features to standard C language. See this for more details.
Related Article :
Executing main() in C – behind the scene
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
- Is it fine to write "void main()" or "main()" in C/C++?
- Difference between "int main()" and "int main(void)" in C/C++?
- Anything written in sizeof() is never executed in C
- Can main() be overloaded in C++?
- Executing main() in C/C++ - behind the scene
- How to write a running C code without main()?
- How to change the output of printf() in main() ?
- return statement vs exit() in main()
- How to print "GeeksforGeeks" with empty main() in C, C++ and Java?
- Functions in C/C++
- Nested functions in C
- C | Functions | Question 11
- C | Functions | Question 10
- C | Functions | Question 9
- C | Functions | Question 8