This week's book giveaway is in the Servlets forum. We're giving away four copies of Murach's Java Servlets and JSP and have Joel Murach on-line! See this thread for details.

For some reason which passes understanding my teacher has asked that we Create a program that will calculate the area of a formula using Heron's formula which is area = squareroot(S * (S - A) * (S - B) * (S - C)) Where S = the perimeter of the triangle divided by 2. and Where A,B,C are the lengths of the three sides. Looking through my textbook and the material that we have covered in class the only way i can figure out to write that line is

but this always gives me an area of zero so i'm pretty sure that this isn't the best way to go about writing the algorithm. I personally think that it's getting messed up in the squareroot part but if someone could please help me with this algorithm that would be great thanks a lot.

Other than using Math.sqrt(x) instead of Math.pow(x, 0.5), my only suggestion is to post more of your code. I just coded up a solution using your formula and it worked. Well, I didn't verify the areas, but it prints zero only when I expect it (a + b == c, which is an empty triangle).

So to recap.

Use Math.sqrt()

Post more of your code

Post output from a run that demonstrates failure, preferably with printlns of your sides and permeter (any intermediate calculations)

thank you guys for all of this as it turns out my code is right but i wasn't thinking beacause my test that i was using was sides = 1,2,3 which isn't a triangle(boy i felt stupid) but thank all of you for your suggestions. Sorry it took so long to thank you guys I fell asleep last night

David Harkness
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Joined: Aug 07, 2003
Posts: 1646

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Yes, I did the same thing as well: 1 1 2 == 0 ... "What?! Mine doesn't work either."