【c++程序】分数的约分

#include<iostream>
using namespace std;
class Fract
{
	int n;
	int d;
public:
	Fract():n(0),d(1){};
	Fract(int an,int ad):n(an),d(ad)
	{
		reduce();
	}
	void reduce()
	{
		if(n<0){d=-d;n=-n;}
		if(d==0){cout<<"d==0!"<<endl;}
		int absn=n<0?-n:n;
		for(int i=d;i>1;i--)
		{
			if(n%i==0&&d%i==0)
				n/=i,d/=i;
			break;
		}
	}
	void show()
	{
		cout<<n<<'/'<<d<<endl;
	}
	double value()
	{
		return (double)n/d;
	}
};
class Dai:public Fract
{
	int i;
public:
	Dai():i(0){}
	Dai(int ai,int an,int ad):i(ai),Fract(an,ad){}
	void show()
	{
		cout<<i<<'(';
		Fract::show();
	}
	double value()
	{
		return i+Fract::value();
	}
};
int main()
{
	Dai d1;
	Dai d2(2,12,16);
	d1.show();
	cout<<"d1="<<d1.value()<<endl;
	d2.show();
	cout<<"d2="<<d2.value()<<endl;
	cout<<"================================="<<endl;
	Fract f1(12,16);
	Fract f2;
	f1.show();
	cout<<"f1="<<f1.value()<<endl;
	f2.show();
	cout<<"f2="<<f2.value()<<endl;

}