Romberg积分法求解方程根 c++语言

#include
#include
#include
using namespace std; 
#define f(x) (1/x)  
class ROMBERG
{
public:
       double a[4];
      
};
double Romberg(double aa, double bb ,double  epsilon, double MAXREPT )
{ 
    ofstream outfile("out.txt",ios::out);
       int m, n;
       n=2^m ;
       double h, x;
       double s, q;
       double ep;    
       double *y = new double[MAXREPT];   
       double p;  
       h = bb - aa; 
       y[0] = h*(f(aa) + f(bb))/2.0;   
       m = 1;    
       n = 1;
       ep = epsilon + 1.0;  
      
       if(MAXREPT<=1)
       {
              cout<<"迭代次数必须大于1" <<endl;
       }
      
       else
       {  
              if(MAXREPT<6)
              {
                     cout<<"没有达到最大迭代次数" <<endl;
              }
              while ((ep>= epsilon) && (m < MAXREPT))    
              {                                      
                     p = 0.0;        
                     for (int i=0; i
                     {            
                            x = aa + (i+0.5)*h;            
                            p = p + f(x);        
                     }        
                     p = (y[0] + h*p)/2.0;//求T2n = 1/2(Tn+Hn),用p指示
                    
                     cout<<"第"<<i<<"次迭代结果为："<<p<<endl;
                     outfile<<"第"<<i<<"次迭代结果为："<<p<<endl;
                     //求第m行元素,根据Romberg计算表本行的前一个元素(p指示),        
                     //和上一行左上角元素(y[k-1]指示)求得.               
                     s = 1.0; 
                     for (int k=1; k<=m; k++)     
                     {             
                            s = 4.0*s;             
                            q = (s*p - y[k-1])/(s - 1.0);
                            y[k-1] = p;            
                            p = q;        
                     }        
                     ep = fabs(q - y[m-1]);
                     m = m + 1;
                     y[m-1] = q;         
                     n = n + n; h = h/2.0;
              }
              outfile<<q<<endl;
              outfile<<"积分结果:"<<q<<endl;
       }
       return (q);
}  
int main()
{ 
       ROMBERG xl;
       double a,b; 
       ifstream infile("in.txt",ios::in);
       if(!infile)
       {
              cerr<<"In file open error!"<<endl;
              exit(1);
       }
       for(int i=0;i<4;i++)
              infile>>xl.a[i];
       a=xl.a[0];b=xl.a[1];
       cout<<"积分结果:"<<Romberg(a, b,xl.a[2],xl.a[3])<<endl; //   
       system("pause");
       return 0;
}