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

For everyone, just starting with C++ or programming at all. Ask newbie questions in this forum!

Moderators: Darobat, RecursiveS, Dante Shamest, Bugdude, Wizard

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

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;}`

Posts: 1
Joined: Tue Apr 17, 2012 11:11 pm

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

:]

schloob

Posts: 1853
Joined: Mon Feb 16, 2004 10:29 am
Location: Seattle