Heron.java Source code

Introduction

Here is the source code for Heron.java

Source

/** Compute the area of a triangle using Heron's Formula.
 * Code and values from Prof W. Kahan and Joseph D. Darcy.
 * See http://www.cs.berkeley.edu/~wkahan/JAVAhurt.pdf.
 * Derived from listing in Rick Grehan's Java Pro article (October 1999).
 * Simplified and reformatted by Ian Darwin.
 */
public class Heron {
    public static void main(String[] args) {
        // Sides for triangle in float
        float af, bf, cf;
        float sf, areaf;

        // Ditto in double
        double ad, bd, cd;
        double sd, aread;

        // Area of triangle in float
        af = 12345679.0f;
        bf = 12345678.0f;
        cf = 1.01233995f;

        sf = (af + bf + cf) / 2.0f;
        areaf = (float) Math.sqrt(sf * (sf - af) * (sf - bf) * (sf - cf));
        System.out.println("Single precision: " + areaf);

        // Area of triangle in double
        ad = 12345679.0;
        bd = 12345678.0;
        cd = 1.01233995;

        sd = (ad + bd + cd) / 2.0d;
        aread = Math.sqrt(sd * (sd - ad) * (sd - bd) * (sd - cd));
        System.out.println("Double precision: " + aread);
    }
}