说明: #include using namespace std; class fen { public: //fen(){a=0;b=0;} fen(int x=1,int y=1){a=x;b=y;} ~fen(){} void show(){cout<<a<<"/"<<b<<endl;} fen operator+(fen &f1); fen operator=(fen &f1); private: int a,b; }; fen fen::op
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