When i try this on DartPad output is like this. Anyone can explain ?
Why is output of {42.05 + 0.05 } like this on Dart Lang?
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This is expected behavior. Double numbers cannot represent all decimal fractions precisely, and neither
0.05nor42.05are the exact values that thedoublevalues represent. The exact values are:If you add these two exact values, the result can yet again not be represented exactly as a double. The two closest representable doubles are:
Of these, the former is closer to the correct result of the addition, so that is the
doublevalue chosen to represent that result.This issue is not specific to Dart. All language using IEEE-754 64-bit floating point numbers will get the same result, and that is probably all languages with a 64-bit floating point type (C, C++, C#, Java, JavaScript, etc).