第九周 任务5

#include < iostream >

using namespace std;

class CEquation

{

private:

	char c;

	double a;     // 未知数系数

	double b;     // 常数项

	char unknown; // 未知数的符号

public:

	CEquation ( double aa = 0, double bb = 0 ) : a ( aa ), b ( bb ) { }

	friend istream &operator >> ( istream &in, CEquation &e );

	friend ostream &operator << ( ostream &out, CEquation &e );

	double Solve( );

	char getUnknown( );

};

istream & operator >> ( istream &in, CEquation &e )

{

    char d;

	int m;

	in >> e.a >> e.unknown >> e.c >> e.b >> d >> m;

    return in;

}

ostream &operator << ( ostream &out, CEquation &e )

{

	out << e.a << e.unknown << e.c << e.b << "+0";

	return out;

}

double CEquation :: Solve( )

{

	double s;

	if ( c == '-') s = b / a;

	else s= - ( b / a );

	return s;

}

char CEquation :: getUnknown( )

{

	return unknown;

}

int main( )

{

	CEquation e;

	cout << "请输入一元一次方程(输入格式：3x-8=0)：";

	cin >> e;                                        //在两次测试中，分别输入3x-8=0和5s+18=0

	cout << "方程为：" << e;

	cout << "方程的解为：" << e.getUnknown( ) << "=" << e.Solve( ) << endl; //对两次测试，分别输出x=...和s=...

	e.Solve( );

	system ( "pause" );

	return 0;

}
#include < iostream >

using namespace std;

class CEquation

{

private:

	char c;

	double a;     // 未知数系数

	double b;     // 常数项

	char unknown; // 未知数的符号

public:

	CEquation ( double aa = 0, double bb = 0 ) : a ( aa ), b ( bb ) { }

	friend istream &operator >> ( istream &in, CEquation &e );

	friend ostream &operator << ( ostream &out, CEquation &e );

	double Solve( );

	char getUnknown( );

};

istream & operator >> ( istream &in, CEquation &e )

{

    char d;

	int m;

	in >> e.a >> e.unknown >> e.c >> e.b >> d >> m;

    return in;

}

ostream &operator << ( ostream &out, CEquation &e )

{

	out << e.a << e.unknown << e.c << e.b << "+0";

	return out;

}

double CEquation :: Solve( )

{

	double s;

	if ( c == '-') s = b / a;

	else s= - ( b / a );

	return s;

}

char CEquation :: getUnknown( )

{

	return unknown;

}

int main( )

{

	CEquation e;

	cout << "请输入一元一次方程(输入格式：3x-8=0)：";

	cin >> e;                                        //在两次测试中，分别输入3x-8=0和5s+18=0

	cout << "方程为：" << e;

	cout << "方程的解为：" << e.getUnknown( ) << "=" << e.Solve( ) << endl; //对两次测试，分别输出x=...和s=...

	e.Solve( );

	system ( "pause" );

	return 0;

}