Description: use a three-layers BP network to recognize
2 types of letter,the output of L is 1,the output of T is 0.
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File list (Check if you may need any files):
letter_recognition
..................\data.txt
..................\Debug
..................\.....\letter_recognition.exe
..................\.....\letter_recognition.ilk
..................\.....\letter_recognition.pch
..................\.....\letter_recognition.pdb
..................\.....\main.obj
..................\.....\vc60.idb
..................\.....\vc60.pdb
..................\init.txt
..................\letter_recognition.dsp
..................\letter_recognition.dsw
..................\letter_recognition.ncb
..................\letter_recognition.opt
..................\letter_recognition.plg
..................\main.cpp
..................\res.txt