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=0cout << "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=0cout << "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;}