printf flush at program exit

Question

I\'m interested in knowing how the printf() function\'s flush works when the program exits.

Let\'s take the following code:

int main(int         


        

Answer 1

When the program exits normally, the exit function has always performed a clean shutdown of the standard I/O library, this causes all buffered output data to be flushed.

Returning an integer value from the main function is equivalent to calling exit with the same value.So, return 0 has the same effect with exit(0)

If _Exit or _exit was called, the process will be terminated immediately, the IO won't be flushed.