How do I round a double to one decimal place? [closed]

How do I round a double to one decimal place? [closed]

References

Reference NO 1

http://stackoverflow.com/questions/15193739/how-do-i-round-a-double-to-one-decimal-place

Reference NO 2

http://stackoverflow.com/questions/374316/round-a-double-to-x-significant-figures

Reference NO 3

http://www.dreamincode.net/forums/topic/8205-how-to-round-double-to-one-decimal-place/

Reference NO 4

http://www.gamedev.net/topic/508767-rounding-to-1-decimal-place-in-java/

Reference NO 5

http://groovy.codehaus.org/groovy-jdk/java/lang/Double.html

Reference NO 6

http://www.cplusplus.com/forum/general/4011/

Reference NO 7

https://www.mathworks.com/matlabcentral/newsreader/view_thread/169196

Reference NO 8

http://gmatclub.com/forum/gpa-rounding-question-1-or-2-decimal-places-67921.html