increase performance for the following small code

increase performance for the following small code

References

Reference NO 1

http://stackoverflow.com/questions/13639978/increase-performance-for-the-following-small-code

Reference NO 2

http://en.wikipedia.org/wiki/Program_optimization

Reference NO 3

http://en.wikibooks.org/wiki/Optimizing_C%2B%2B/Writing_efficient_code/Performance_improving_features

Reference NO 4

http://developer.yahoo.com/performance/rules.html

Reference NO 5

http://msdn.microsoft.com/en-us/library/ff647790.aspx

Reference NO 6

https://developers.google.com/speed/articles/identifying-page-speed-problems

Reference NO 7

https://developer.apple.com/library/mac/documentation/Performance/Conceptual/OpenCL_MacProgGuide/Performance/Performance.html

Reference NO 8

http://www.mathworks.com/company/newsletters/articles/improving-simulation-performance-in-simulink.html