#include<iostream.h>
#include<math.h>

#ifndef TERM
#define TERM
class polynomial;
class term
{
public:
	//構造函數,默認構造一個指數系數均為零的零項
	term(double c=0, int p=0);
	term(const term &x);       //拷貝構造函數
	double getCoefficient();  //取系數
    int getPower();       //取指數
	void setCoefficient(double c);  //改系數
	void setPower(int p);           //改指數
	term operator =( const term & right);
	//以下三個為項之間的加減乘函數,加和減要求相加的項指數相同
	friend term operator * (const term& left, const term& right);
	friend term operator + (const term& left, const term& right);
	friend term operator - (const term& left, const term& right);
	//項的求負函數,建立一個系數為參數項的相反數,而指數與參數項相同的項,并返回求負后的項
	friend term operator - (const term& l);
	//判斷兩個項是否相等,要求系數指數均相等才認為兩個項相等
	friend bool operator ==(const term& l, const term& r);
	//判斷兩個項是否不等,當系數和指數中之一不同是則兩個項不等
	friend bool operator !=(const term& l, const term& r);
	//以下兩個函數為比較兩個項的指數的大小的函數
	friend bool operator < (const term& l, const term& r);
	friend bool operator > (const term& l, const term& r);
	double evalAt(double x); //計算x處的值
	friend istream& operator >>(istream& is,term& val);
	friend ostream& operator << (ostream& os,const term& val);
private:
	double coefficient; //系數
	int power;   //指數
};
#endif