文件名称:Calculate
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这个小程序实现了算术计算，通过此程序可以自己设置答题数目，答题位数，并且有错误提示，正确答案显示和出错率统计-This applet implements arithmetic, through this program you can set up their own answer number, answer the median, and has error, the correct answer is displayed and the error rate statistics
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Calculate.cpp