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Editorial Team
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Asked: 2026-05-13T05:34:54+00:00

float totalAmount = 0; . . .//totalAmount assigned value 1.05 correctly . totalAmount +=

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float totalAmount = 0;
.
.
.//totalAmount assigned value 1.05 correctly
.
totalAmount  += float.Parse(dataRow["Amt"].ToString()); //where dataRow["Amt"] has value 4.93

The answer I get for totalAmount is 5.97999954 instead of 5.98

Why is this happening?

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1 Answer

  1. Editorial Team

    You state that totalAmount is 1.05, before the accumulation. That would give expected results of:

    1.05
4.93 +
------
5.98

    You are getting 5.97999954, which is basically the answer as best represented by IEEE floating point, which is a binary format that cannot exactly express every decimal number. For instance, the rather common 0.110 has an infinite binary floating point representation .0001100110011...2.

    And a Wikipedia link, for good measure: http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems 😉

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