[cs631apue] exit() vs return in c programs

[Sadia Akhter]

Hi,

In my previous experience with C, I have always used "return 0;" to return from main() function. Those were of course not any system programming codes. However, in the text book APUE, I noticed that they always use "exit(0)" in main(). Can anyone tell me why is that? Is there any significant difference between these two? Or is it just regular practice?

Thanks,
Sadia Akhter