Java Program to Implement Horner Algorithm

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This is a Java Program to Implement Horner Algorithm. Horner’s method is an efficient method for calculating polynomials.
Here is the source code of the Java Program to Implement Horner Algorithm. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. /**
  2.  ** Java Program to implement Horner Algorithm
  3.  **/
  4.  
  5. import java.util.Scanner;
  6.  
  7. public class Horner
  8. {
  9.     private int sum;
  10.     /** constructor **/
  11.     public Horner(int[] cof, int x)
  12.     {
  13.         sum = 0;
  14.         calcSum(cof, x, cof.length - 1);
  15.         display();
  16.     }
  17.     /** Calculate sum **/
  18.     private void calcSum(int[] cof, int x, int N)
  19.     {
  20.         sum = cof[N] * x;
  21.         for (int i = N - 1; i >= 1; i--)
  22.             sum = (sum + cof[i]) * x;
  23.         sum += cof[0];
  24.     }
  25.     public void display()
  26.     {
  27.         System.out.println("Evaluated sum = "+ sum);
  28.     }
  29.     /** main method **/
  30.     public static void main(String[] args) 
  31.     {
  32.         Scanner scan = new Scanner(System.in);
  33.         System.out.println("Horner Algorithm Test\n");
  34.         System.out.println("Enter highest power");
  35.         int n = scan.nextInt();
  36.         int[] arr = new int[n + 1];
  37.         System.out.println("\nEnter "+ (n + 1) +" coefficients in increasing order");
  38.         for (int i = 0; i <= n; i++)
  39.             arr[i] = scan.nextInt();
  40.         System.out.println("\nEnter x");
  41.         int x = scan.nextInt();
  42.         Horner h = new Horner(arr, x);
  43.     }
  44. }

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Horner Algorithm Test
 
Enter highest power
5
 
Enter 6 coefficients in increasing order
1 2 3 4 5 6
 
Enter x
2
Evaluated sum = 321

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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