Why is this local variable's value changing?

Why is this local variable's value changing?

References

Reference NO 1

http://stackoverflow.com/questions/13640021/why-is-this-local-variables-value-changing

Reference NO 2

http://www.autoitscript.com/wiki/Variables_-_using_Global,_Local_and_ByRef

Reference NO 3

http://www.chemie.fu-berlin.de/chemnet/use/info/elisp/elisp_11.html

Reference NO 4

http://msdn.microsoft.com/en-us/library/windows/hardware/ff552052(v=vs.85).aspx

Reference NO 5

http://www.lua.org/pil/4.2.html

Reference NO 6

http://www.ibiblio.org/g2swap/byteofpython/read/local-variables.html

Reference NO 7

http://support.sas.com/documentation/cdl/en/mcrolref/61885/HTML/default/a001072111.htm

Reference NO 8

http://freemarker.org/docs/dgui_misc_var.html