c++ function returning variable length

Question

I have a problem with the length of the returning value of the function, When I calculate stuff it gives me varibles with different length, thats why I cant sum them and compare.

For example: the function calculates the length of the line AC it gives 4.24264 the line AC consists of two other lines AB and BC which are AB = 0.942809 and BC=3.29983 when you sum AB and BC it equals of 4.242639 but the same function gives 4.24264, so C++ does not say that they are equal, so how do I change that?

EDIT: function returns double and all of the variables are double

`double` or `float` numbers are almost never equal. You need to compare them with some accuracy... e.g. `fabs(x-y) < 1.0e-6*max(fabs(x),fabs(y))` — Basile Starynkevitch, Nov 27 '13 at 18:49
Here's a good read for you: http://support.microsoft.com/kb/42980 — edtheprogrammerguy, Nov 27 '13 at 18:51

score 4 · Accepted Answer · edited May 23 '17 at 12:19

4

Looks like you're dealing with float / double comparison. This might help.

edited May 23 '17 at 12:19

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answered Nov 27 '13 at 18:51

mbmc

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c++ function returning variable length

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