第九周实验报告五

#include "iostream"
using namespace std;
class CEquation
{
private:
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();
};

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;
}

istream &operator >> (istream &in,CEquation &e)
{
double d;
char v;
in >> e.a >> e.unknown >> e.b >> v>> d;
return in;
}
ostream &operator << (ostream &out,CEquation &e)
{
if(e.b >= 0)
{
out << e.a << "x+" << e.b <<"="<<"0";
}
else
{
out << e.a << "x" << e.b <<"="<<"0";
}
return out;
}
double CEquation::Solve()
{
double d;
return ((-b)/a);

}
char CEquation::getUnknown()
{
return unknown;
}