分数除法
//fraction.h
#include"utility.h"
#include<iostream.h>
class Fraction
{
private:
int nume;
int deno;
int Gcf(int m,int n);
public:
Fraction(int n=1,int d=1);
virtual ~Fraction(){};
bool dight(char ch);
void Reduction();
int GetNume(){return nume;}
int GetDeno(){return deno;}
void SetNume(int n);
void SetDeno(int d);
Fraction operator +(Fraction&a);
Fraction operator -(Fraction&a);
Fraction operator *(Fraction&a);
Fraction operator /(Fraction&a);
friend ostream& operator <<(ostream&out,Fraction&a);
friend istream& operator >>(istream&out,Fraction&a);
};
int Fraction::Gcf(int m,int n)
{
if(n==0)
return m;
else
return Gcf(n,m%n);
}
Fraction::Fraction(int n,int d)
{
nume=(n);
deno=(d);
if(deno==0)
throw Error("分母为0");
Reduction();
}
bool Fraction::dight(char ch)
{
if(ch>='1')
return true;
else
return false;
}
void Fraction::Reduction()
{
if(deno<0)
{
nume=-nume;
deno=-deno;
}
int f=Gcf(abs(nume),deno);
nume=nume/f;
deno=deno/f;
}
void Fraction::SetNume(int n)
{
nume=n;
Reduction();
}
void Fraction::SetDeno(int d)
{
deno=d;
Reduction();
}
Fraction Fraction::operator +(Fraction&a)
{
Fraction result;
result.nume=nume*a.deno+a.nume*deno;
result.deno=deno*a.deno;
result.Reduction();
return result;
}
Fraction Fraction::operator -(Fraction&a)
{
Fraction result;
result.nume=nume*a.deno-a.nume*deno;
result.deno=deno*a.deno;
result.Reduction();
return result;
}
Fraction Fraction::operator *(Fraction&a)
{
Fraction result;
result.nume=nume*a.nume;
result.deno=deno*a.deno;
result.Reduction();
return result;
}
Fraction Fraction::operator /(Fraction&a)
{
if(a.nume==0)
throw Error("除数为零");
Fraction result;
result.nume=nume*a.deno;
result.deno=deno*a.nume;
result.Reduction();
return result;
}
ostream& operator <<(ostream&out,Fraction&a)
{
out<<a.GetNume()<<"/"<<a.GetDeno();
return out;
}
istream& operator >>(istream&in,Fraction&a)
{
char ch;
int m,n;
in>>m;
ch=GetChar();
if(ch!='/')
throw Error("非法字符");
in>>n;
if(n==0)
throw Error("分母为零");
while(in.get()!='\n');
a.SetDeno(n);
a.SetNume(m);
a.Reduction();
return in;
}
//main.cpp
#include"fraction.h"
void main()
{
try
{
Fraction result;
Fraction cur;
char select;
cout<<"输入一个分数:";
cin>>result;
do
{
cout<<"当前结果:"<<result<<endl;
do
{
cout<<"请选择【加,减,乘,除,等于,清零和退出(+,-,*,/,=,C,X)】:";
select=GetChar();
while(cin.get()!='\n');
select=toupper(select);
}while(select!='+'&&select!='-'&&select!='*'&&select!='/'&&select!='='&&select!='C'&&select!='X');
switch(select)
{
case'+':
cout<<"输入一个分数:";
cin>>cur;
result=result+cur;
break;
case '-':
cout<<"输入一个分数:";
cin>>cur;
result=result-cur;
break;
case '*':
cout<<"输入一个分数:";
cin>>cur;
result=result*cur;
break;
case '/':
cout<<"输入一个分数:";
cin>>cur;
result=result/cur;
break;
case '=':
break;
case 'C':
result=0;
break;
}
}while(select!='X');
}
catch(Error err)
{
err.Show();
}
system("pause");
}
