c++用类求解一元二次方程

编写一个类，实现一元二次方程组的求解 要求：（1）类的数据成员和函数成员（包括构造函数）要设计清晰，对它们的访问做好限定；（2）有两个构造函数，其中一个不带参数，另一个带参数，不带参数构造函数初始化a=1,b=2,c=2,类最终实现方程组x*x+2x+2=0的解，带参数的构造函数通过对外接口获得a，b，c，并解方程；（4）main函数调用类实现解方程和输出结果。

我最后编的 有什么问题 请高手指正 谢谢

#include<iostream>
#include<math.h>
using namespace std;
class M
{public:
M();
M(float a,float b,float c):A(a),B(b),C(c){}
float X();
private:
float A;
float B;
float C;
};
M::M()
{
A=1;
B=2;
C=2;
}

float M::X()
{
float a,b,c,d,e,x1,x2;
d=b*b-4*a*c;
if(a=0)
{
x1=x2=-c/b;
cout<<"x="<<x1<<endl;
}
else
{
if(d<0)
{
e=sqrt(d);
x1=-b/(2*a)+e/(2*a);
x2=-b/(2*a)-e/(2*a);
cout<<"x1="<<x1;
cout<<"i"<<endl;
cout<<"x2="<<x2;
cout<<"i"<<endl;
}
if(d==0)
{
cout<<"There is only x."<<endl;
x1=x2=(-b)/(2*a);
cout<<"x1=x2="<<x1<<endl;
}
if(d>0)
{
e=sqrt(d);
x1=(-b+e)/(2*a);
x2=(-b-e)/(2*a);
cout<<"x1="<<x1<<endl;
cout<<"x2="<<x2<<endl;
}
}
return(x1,x2);
}
int main()
{
cout<<"a=1,b=2,c=2"<<endl;
M m1;
m1.X();
M m2;
float a,b,c;
cout<<"a: ";
cin>>a;
cout<<"b: ";
cin>>b;
cout<<"c: ";
cin>>c;
m2.X();
return 0;
}

#include<iostream>
#include<math.h>
using namespace std;
class M
{public:
M();
M1(float a,float b,float c);
M(float a,float b,float c){}
float X();
public:
float A;
float B;
float C;
};
M::M()
{
A=1;
B=2;
C=2;
}

M::M1(float a,float b,float c){
A = a;
B = b;
C = c;
}

float M::X()
{
cout<<"A="<<A;
cout<<"B="<<B;
cout<<"C="<<C<<endl;
float d,e,x1,x2;
d=B*B-4*A*C;
cout<<"d="<<d<<endl;
if(A==0)
{
x1=x2=-C/B;
cout<<"x="<<x1<<endl;
}
else
{
if(d<0)
{
e=sqrt(d);
cout<<"e1="<<e<<endl;
x1=-B/(2*A)+e/(2*A);
x2=-B/(2*A)-e/(2*A);
cout<<"x1="<<x1;
cout<<"i"<<endl;
cout<<"x2="<<x2;
cout<<"i"<<endl;
}
if(d==0)
{
cout<<"There is only x."<<endl;
x1=x2=(-B)/(2*A);
cout<<"x1=x2="<<x1<<endl;
}
if(d>0)
{
e=sqrt(d);
cout<<"A="<<A;
cout<<"B="<<B;
cout<<"C="<<C<<endl;
cout<<"e2="<<e<<endl;
x1=(-B+e)/(2*A);
x2=(-B-e)/(2*A);
cout<<-B+e<<endl;
cout<<2*A<<endl;
cout<<-B-e<<endl;
cout<<"x1="<<x1<<endl;
cout<<"x2="<<x2<<endl;
}
}
return(x1,x2);
}
int main()
{
cout<<"a=1,b=2,c=2"<<endl;
M m1;
m1.X();
M m2;
float a,b,c;
cout<<"a: ";
cin>>a;
cout<<"b: ";
cin>>b;
cout<<"c: ";
cin>>c;
m2.M1(a,b,c);
m2.X();
return 0;
}

这是在你的程序上修改后的程序，你对比下看看吧

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