word_find
代码说明：
英文词频统计，单复数算一个单词，大小写算一个单词(word frequency find)
文件列表：
word_find
.........\build-homework-桌面-Debug
.........\.........................\debug
.........\.........................\.....\homework.exe,923075,2014-11-20
.........\.........................\.....\main.o,122001,2014-11-15
.........\.........................\.....\mainwindow.o,344416,2014-11-20
.........\.........................\.....\moc_mainwindow.cpp,3288,2014-11-15
.........\.........................\.....\moc_mainwindow.o,135020,2014-11-15
.........\.........................\Makefile,6028,2014-11-17
.........\.........................\Makefile.Debug,5870,2014-11-17
.........\.........................\Makefile.Release,5943,2014-11-17
.........\.........................\release
.........\.........................\ui_mainwindow.h,5882,2014-11-15
.........\build-homework-桌面-Release
.........\...........................\debug
.........\...........................\Makefile,5897,2014-11-15
.........\...........................\Makefile.Debug,5809,2014-11-15
.........\...........................\Makefile.Release,5882,2014-11-15
.........\...........................\release
.........\...........................\.......\homework.exe,88576,2014-11-16
.........\...........................\.......\main.o,1217,2014-11-15
.........\...........................\.......\mainwindow.o,29491,2014-11-16
.........\...........................\.......\moc_mainwindow.cpp,3288,2014-11-15
.........\...........................\.......\moc_mainwindow.o,9038,2014-11-15
.........\...........................\ui_mainwindow.h,5882,2014-11-15
.........\homework
.........\........\homework.pro,381,2014-11-15
.........\........\homework.pro.user,17756,2014-11-20
.........\........\homework.pro.user.1caf6b8,17723,2014-11-16
.........\........\main.cpp,183,2014-11-15
.........\........\mainwindow.cpp,3665,2014-11-20
.........\........\mainwindow.h,625,2014-11-15
.........\........\mainwindow.ui,4230,2014-11-15
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