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→To Do 10
*#: returns a character string holding the bit pattern of val (i.e cout<<bits(0xF7)<<endl, will print 11110111)
*# write the void prnBits(unsigned int val) function (wrote in class) in only one line.
* I tried one two of the functions at http://yun811.blogspot.ca/ Yun Yang's oop344
* My drafts on char* bits(unsigned int val) : http://itactics.wordpress.com/2012/11/20/code-how-to-print-binary/ (Diaoqiang He)
* I have the solutions for all of three functions at my blog - http://linpei.blogspot.ca/ (Linpei Fan)
