What is a good way to compare the speed of algorithms in c++. For example, a simple line drawing algorithm can be written either in the classic way using y=mx+b to calculate the next point in a line or it can be done using Bresenham's Line algorithm which gets rid of the floating point math needed in the classic aproach. I would like to see which one of these algorithms will draw a line faster. How can I calculate how fast each one of these approches draws the line?

thanks