Asp.net C# math problem

Question

I'm trying to build a "simple" web app that calculates either a male or females body fat % based on the U.S. Navy's circumference formula. I have the majority of the app completed at this point. However, I cannot figure out why the way I've setup the formula below won't work. Two of the values are underlined in red in my .cs file.

My Formula:

TBBodyFat.Text = Convert.ToString(495 / (1.0324-.19077(Math.Log(Convert.ToDouble(TBWaist.Text)-Convert.ToDouble(TBNeck.Text)))+.15456(Math.Log(Convert.ToDouble(TBHeight.Text)))));

Original Example:

%Fat=495/(1.0324-.19077(log(abdomen-neck))+.15456(log(height)))-450

Pop-Up for the two underlined values (.19077 and .15456):

struct System.Double  
Represents a double-precision floating-point number.

Error:  
Method name expected

Will A seems to have the solution for you, but I have to recommend that if that is your formatting and not just a result of the copy and paste then you may want to consider formatting differently to make issues such as this more evident. Possibly breaking this formula out across multiple lines may make it easier for you to debug issues later on. Then again my programming doesn't usually require much complex math so formatting it that way may be like sticking a fork into your eye for those who regularly have to deal with this type of code. — joshlrogers
– joshlrogers, Commented Aug 1, 2010 at 0:12

Will A · Accepted Answer · 2010-08-01 00:06:36Z

6

    TBBodyFat.Text = Convert.ToString(495 / (1.0324-.19077*
(Math.Log(Convert.ToDouble(TBWaist.Text)-Convert.ToDouble(TBNeck.Text)))+.15456*
(Math.Log(Convert.ToDouble(TBHeight.Text)))));

C# (not any programming language I've yet encountered) does not take adjacency of numbers to mean multiplication!

answered Aug 1, 2010 at 0:06

Will A

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4 Comments

Abel Over a year ago

in less than 55 seconds! That's quick ;-)

Will A Over a year ago

8-) - I try! Someone will no doubt come up with a language that does respect algebraic conventions. :)

Chris Over a year ago

It's always the obvious things that end up being the culprit...that was it and it now works. Thanks for the help!!

Will A Over a year ago

My pleasure - enjoy your coding!

Mau · Accepted Answer · 2010-08-01 00:30:46Z

4

Well you need to use "*" for multiplication. ~~Plus I'm not sure whether C# allows ".123" style numeric literals without leading 0.~~

Try:

 TBBodyFat.Text =
      Convert.ToString(495/
         (1.0324-0.19077*(Math.Log(Convert.ToDouble(TBWaist.Text)-Convert.ToDouble(TBNeck.Text)))+0.15456*(Math.Log(Convert.ToDouble(TBHeight.Text)))));

edited Aug 1, 2010 at 0:30

answered Aug 1, 2010 at 0:09

Mau

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1 Comment

Abel Over a year ago

"whether C# allows ".123" style numerl literals " >> they do ;-)

user2419040 · Accepted Answer · 2013-05-24 21:26:42Z

-1

Put * while multiplying like .8*(b-200) .If you will put directly .8(b-200) it will show error that method name expected.

answered May 24, 2013 at 21:26

user2419040

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