So what does "return 0" actually mean?
c, return
Solution
Is it like php, where it returns its argument as the value of the function call? Is it just good practise?
Yes, PHP and many other languages borrowed the `return` keyword from 'C'. And in all the languages, the `return` keyword has the same function - to return from the function. Anything that follows `return` keyword is the value that is returned to the caller.
Is it a good practise? Yes and No. Not all functions should return a value. And quite a few in the standard library even, do not return any value. Hence their return type is `void`.
But `main` function should return `0`(also `EXIT_SUCCESS`) to identify that the program has executed successfully. And -1 otherwise (also `EXIT_FAILURE`)
EDIT: (Thanks to @KeithThompson):
`EXIT_FAILURE` is implementation defined. `1` is a common value of `EXIT_FAILURE` but the whole point is, you need not know.
Problem
I'm pretty proficient in PHP, but I've started dabbling with C. I've seen the code ``` return 0; ``` at the end of functions that don't return a value. This isn't used in PHP, because if a function is doesn't have a return, a value NULL is automatically returned. All I'm asking is, in simple English, what does the `return 0` actually do? Is it like PHP, where it returns its argument as the value of the function call? Is it just good practice? I know this question has been asked many times before, but I'm asking it from the point of view of a PHP developer. The answers google throws up haven't been that concise.