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Why the result of these two expressions should be different ?
The same thing happens in gcc and python. what is happening in here ? Is there any way to prevent it ?
Floating point numbers have limited precision. If you add a small number (3) to a large number (1e20), the result often is the same as the large number. That is the case here, hence
The precision of
doubleis roughly 15 decimal digits,floats have about 7 decimal digits of precision.