The answer you seek depends on you definition of 'perfect circle'.
If you mean a circle with no perceivable deformities you can see, then we can see these almost everyday.

It's less of being the programming language than the resolution of the screen.
Using any programming language, I can tell the computer to draw a circle. But how smooth you perceive the edges of the circle is determined by the resolution of the screen you're looking at. A high resolution will produce what our eyes perceive to be a perfect circle. A low resolution (Should I decide to set your monitor to only 64 pixels), will probably look as if I cellotaped 4 squares together.