c++(synthetic division,Horner's law polynomial solution)

[undead]

My code can't calculated a complex root, imaginare numbers. i don't know how can i used this library #include <complex.h>, please correct my code and show me errors please.

Code: Select all

//horner's polynomial soln, synthetic division
#include <iostream>
#include <conio.h>
#include <stdio.h>
#include <math.h>
using namespace std;

int main()
{
   int it, n, i;
   double *a,*b,*c,x=-1000;
    cout<<"Enter the degree of the polynomial:";
    cin>>n;
   a=new double [n];
   b=new double [n];
   c=new double [n];
    cout<<"Enter the coefficients of the polynomial"<<endl;
    for ( i = 0; i < n; i++ )
        cin >> a[i];
   
    do
   
   {
        it = 0;
        c[0] = a[0];
        b[0] = a[0];
      
        do
      {
            for ( i = 1; i < n; i++ )
                b[i] = a[i] + x*b[i-1];

            for ( i = 1; i < n; i++ )
                c[i] = b[i] + x*c[i-1];

            x = x - b[n]/c[n-1];
            it++;
        }
      while (abs( b[n]) > 1e-5 && it<100 );
       
      cout << "The root is:" << x << endl;
            
    n--;

        for ( i = 0; i < n; i++ )
            a[i] = b[i];
           
    }
   while( n >= 1 );
   getch();
   
   return 0;

}


[schloob]

i advise: learn to state your problem more precisely