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/** 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);
}
}
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