calculation using formula in iPhone [closed]

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I am working with Humidity calculator where I have to do one equation that is:

e  = 6.1078 * 10 ** ((TD * A)/(TD + B));

but its not working. Any ideas why?

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Maybe by the "**" operator you mean the exponential operator. In that case you might want to use the function exp() with the proper corrections (exp() uses the natural number as its base).

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Why there is 2 *s in that equation?

e = 6.1078 * 10 * ((TD * A)/(TD + B));

This should work. Also , considering TD and B, (TD + B) should not be zero.