
DDA Algorithm 
Bresenham's Line Algorithm 

1. DDA Algorithm uses floating point, real arithmetic.  1. Bresenham's Algorithm uses fixed points, integer arithmetic. 
2. DDA algorithm uses multiplication and division operations.  2. Bresenham's Algorithm uses addition and subtraction operations. 
3. DDA algorithm is slower than Bresenham's Algorithm because it uses real arithmetic floating point operations.  3. Bresenham's Algorithm is faster than DDA algorithm because it uses integer arithmetic. 
4. DDA algorithm can draw circles and curves with less accuracy.  4. Bresenham's Algorithm can draw circles and curves with much more accuracy. 
5. DDA algorithm is less efficient than Bresenham's Algorithm.  5. Bresenham's Algorithm is more efficient than DDA Algorithm. 
6. DDA algorithm roundoff the coordinates to integer that is nearest to the line.  6. Bresenham's Algorithm doesn't roundoff the coordinates. 