Buffered and unbuffered stream

Question

In case of buffered stream it said in a book that it wait until the buffer is full to write back to the monitor. For example:

cout << \"hi\"; 
<         


        

Answer 1

You can check out the differences yourself with a small app.

#include 
int main() {
    std::cout<<"Start";
    //std::cout<<"Start"<

Try out the difference of the two "Start" statments, then change to cerr. The difference you notice is due to buffering.

The for-statement takes about 2 seconds on my rig, you might need to tweak the i < condition on yours.