学步园

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本程序是实现分数的加减乘除的，对+ - * / 进行了重载

//类的头文件<br /> class fraction<br /> {<br /> private:<br /> int nr; //分子<br /> int dn; //分母<br /> public:<br /> fraction input();<br /> fraction operator +(fraction &);<br /> fraction operator -(fraction &);<br /> fraction operator *(fraction &);<br /> fraction operator /(fraction &);<br /> void output(); //输出约分后的分数<br /> void output1(); // 输出普通分数<br /> };<br /> //成员函数<br /> #include<iostream.h><br /> #include"fclass.h"<br /> fraction fraction::operator+(fraction &a)<br /> {<br /> fraction g;<br /> g.dn=dn*a.dn;<br /> g.nr=nr*a.dn+a.nr*dn;<br /> return g;<br /> }<br /> fraction fraction::operator-(fraction &a)<br /> {<br /> fraction g;<br /> g.dn=dn*a.dn;<br /> g.nr=nr*a.dn-a.nr*dn;<br /> return g;<br /> }<br /> fraction fraction::operator*(fraction &a)<br /> {<br /> fraction g;<br /> g.dn=dn*a.dn;<br /> g.nr=nr*a.nr;<br /> return g;<br /> }<br /> fraction fraction::operator/(fraction &a)<br /> {<br /> fraction g;<br /> g.dn=dn*a.nr;<br /> g.nr=nr*a.dn;<br /> return g;<br /> }<br /> fraction fraction::input()<br /> {<br /> fraction a;<br /> cin>>a.nr>>a.dn;<br /> return a;<br /> }<br /> void fraction::output()<br /> {<br /> int i;<br /> if(dn==0)<br /> cout<<"error"<<endl;<br /> else<br /> if(nr%dn==0)<br /> cout<<nr/dn<<endl;<br /> else<br /> {<br /> for(i=2;i<=nr||i<=dn;)<br /> {<br /> if(nr%i==0&&dn%i==0)<br /> {<br /> nr=nr/i;<br /> dn=dn/i;<br /> i=2;<br /> }<br /> else<br /> i++;<br /> }<br /> cout<<nr <<"/"<<dn<<endl;<br /> }<br /> }<br /> void fraction::output1()<br /> {<br /> cout<<nr<<"/"<<dn;<br /> }<br /> //主函数<br /> #include<iostream.h><br /> #include"fclass.h"<br /> void menu()<br /> {<br /> cout<<"=================================================="<<endl;<br /> cout<<"1-输入2个新的分数，可进行如下运算:"<<endl;<br /> cout<<"2-加法"<<endl;<br /> cout<<"3-减法"<<endl;<br /> cout<<"4-乘法"<<endl;<br /> cout<<"5-除法"<<endl;<br /> cout<<"6-退出"<<endl;<br /> cout<<"=================================================="<<endl;<br /> }<br /> void main()<br /> {<br /> void menu();<br /> int m;<br /> bool flag=true;<br /> fraction s1,s2,s3;<br /> while(flag)<br /> { menu();<br /> cin>>m;<br /> switch(m)<br /> {<br /> case 1:<br /> cout<<"请按照如下方式输入2个分数: 分子/分母"<<endl;<br /> s1=s1.input();<br /> s2=s2.input();<br /> cout<<"请输入你要进行的计算:"<<endl;<br /> break;<br /> case 2:<br /> s3=s1+s2;<br /> s1.output1();<br /> cout<<" + ";<br /> s2.output1();<br /> cout<<"=";<br /> s3.output();<br /> break;<br /> case 3:<br /> s3=s1-s2;<br /> s1.output1();<br /> cout<<" - ";<br /> s2.output1();<br /> cout<<"=";<br /> s3.output();<br /> break;<br /> case 4:<br /> s3=s1*s2;<br /> s1.output1();<br /> cout<<" * ";<br /> s2.output1();<br /> cout<<"=";<br /> s3.output();<br /> break;<br /> case 5:<br /> s3=s1/s2;<br /> s1.output1();<br /> cout<<" / ";<br /> s2.output1();<br /> cout<<"=";<br /> s3.output();<br /> break;<br /> case 6:<br /> flag=false;<br /> break;<br /> default:<br /> break;<br /> }<br /> }</p> <p>}