franction.h

简单地分数运算,实现分数地加减乘除运算!

class franction
{
	int nuneration;                      //分子
	int denominator;                          //分母
public:
	franction(int,int);                  //初始化
	void yuefen(int&,int&);                //约分
	void print(franction);
	franction operator + (franction b);   //运算
	franction operator - (franction b);
	friend franction operator / (franction a,franction b);
	friend franction operator * (franction a,franction b);
};

void franction::print(franction a)
{
	
	
	cout<<a.nuneration<<" / "<<a.denominator<<endl;
}
franction::franction(int a,int b)
{
	if(a*b==0)
	{
		cout<<"exit error!"<<endl;
	    a=1;
		b=1;
	}
	yuefen(a,b);
	nuneration=a;
	denominator=b;
}
void franction::yuefen(int& a,int& b)
{
	int i=1,j=1;
	
	while((j<=a)&&(j<=b))
	{
		if((a%j==0)&&(b%j==0))
		       i=j;
		j++;

	}
	
	a=a/i;
	b=b/i;

}
franction franction::operator + (franction b)
{
	
	this->nuneration=(this->nuneration)*(b.denominator)+(b.nuneration*this->denominator);
	this->denominator=(this->denominator)*(b.denominator);
	yuefen(this->nuneration,this->denominator);
	return *this;
}
franction franction::operator - (franction b)
{
  
	this->nuneration=(this->nuneration*b.denominator)-(b.nuneration*this->denominator);
	this->denominator=(this->denominator)*(b.denominator);
	yuefen(this->nuneration,this->denominator);
	return *this;
}

franction operator / (franction a,franction b)
{
	
	a.nuneration=(a.nuneration)*(b.denominator);
	a.denominator=(a.denominator)*(b.nuneration);
	a.yuefen(a.nuneration,a.denominator);
		a.print(a);
	return a;
}
franction operator * (franction a,franction b)
{

	a.nuneration=(a.nuneration)*(a.nuneration);
	a.denominator=(a.denominator)*(b.denominator);
	a.yuefen(a.nuneration,a.denominator);
		a.print(a);
	return a;
}