Why is buffering in C++ important?

Question

I tried to print Hello World 200,000 times and it took me forever, so I have to stop. But right after I add a char array to act as a buffer, it took le

Answer 1

If you have a buffer, you get fewer actual I/O calls, which is the slow part. First, the buffer gets filled, then one I/O call is made to flush the buffer. Will be equally helpful in Java or any other system where I/O is slow.