21july 2011
added correct sign fig for example 9.20 = 9.00+0.20 mm extra 0 at the back using logic and code to make 0 appear
improved 9.20 = 9.00+0.10-(-0.10) mm adding extra 0 at the right else if branch. previously it shown 9.20 = 9.0 + 0.1-(-0.1) mm.

Research and development at its best! teacher lead development with researcher's support!

enjoy!