| 发表于：2007-04-22 12:37:48 楼主 |
#include <iostream.h>
class fraction
{public:
fraction（)
{a=1;b=1;}
fraction（int am,int bm)
{a=am;b=bm;}
friend fraction operator +（fraction m1,fraction m2);
friend fraction operator -（fraction m1,fraction m2);
friend fraction operator *（fraction m1,fraction m2);
friend fraction operator /（fraction m1,fraction m2);
void show（)
{cout < <a < < "/ " < <b < <endl;}
private:
int a,b;
};
fraction operator +（fraction m1,fraction m2)
{fraction temp;
temp.a=m1.a*m2.b+m1.b*m2.b;
temp.b=m1.b*m2.b;
return temp;
}
fraction operator -（fraction m1,fraction m2)
{fraction temp;
temp.a=m1.a*m2.b-m1.b*m2.a;
temp.b=m1.b*m2.b;
return temp;
}
fraction operator *（fraction m1,fraction m2)
{fraction temp;
temp.a=m1.a*m2.a;
temp.b=m1.b*m2.b;
return temp;
}
fraction operator /（fraction m1,fraction m2)
{fraction temp;
temp.a=m1.a*m2.b;
temp.b=m2.a*m1.b;
return temp;
}
void main （)
{cout < < " 说明 " < <endl;
cout < < "此程序用于计算分数的四则运算,用户可根据程序提示,输入分数及运算类型,注意要先输分子再输分母,输完分子后按enter再输分母，分母不得为0,否则程序将退出. " < <endl;
char op,p; //op用于告诉程序运算类型//
int am,bm,an,bn; //am an代表分子,bm bn代表分母//
cout < < "输入运算类型 " < <endl;
cin> > op;
cout < < "输入第一个分数 " < <endl;
cin> > am> > p> > bm;
cout < < "输入第二个分数 " < <endl;
cin> > an> > p> > bn;
fraction m1（am,bm),m2（an,bn),m3;
switch（op)
{case '+ ':{m3=m1+m2;cout < <am < < "/ " < <bm < < " + " < <an < < "/ " < <bn < < "= ";m3.show（);};break;
case '- ':{m3=m1-m2;cout < <am < < "/ " < <bm < < " - " < <an < < "/ " < <bn < < "= ";m3.show（);};break;
case '* ':{m3=m1*m2;cout < <am < < "/ " < <bm < < " * " < <an < < "/ " < <bn < < "= ";m3.show（);};break;
case '/ ':{m3=m1/m2;cout < <am < < "/ " < <bm < < " / " < <an < < "/ " < <bn < < "= ";m3.show（);};break;
default:cout < < "输入有误,程序结束. " < <endl;
}
cout < <endl;
} |
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