4 Create a class named RationalNumber, and it has the following features: 1) create a constructor, it avoids the denominator is zero, for the scores is not about resistance reduction, and to avoid the denominator is negative. 2) heavy-duty class arithmetic operators 3) heavy-duty class relational operators and assignment operator

6_4\6_4.cpp
...\6_4.dsp
...\6_4.dsw
...\6_4.ncb
...\6_4.opt
...\6_4.plg
...\achievement.cpp
...\definition.h
...\ReadMe.txt
...\StdAfx.cpp
...\StdAfx.h
6_4

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