评分标准 1. 对两个类的成员合理地使用访问权限：1分 2. 实现分数与整数的混合运算：1分 3. 程序结构合理，布局清晰，正确地安排.h和.cpp：2分 4. 考虑程序的性能：1分

fraction\fraction.cpp
........\fraction.dsp
........\fraction.dsw
........\fraction.h
........\fraction.ncb
........\fraction.opt
........\fraction.plg
........\test.cpp
fraction

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