Will it really not lost information from long to double?
Hello!
I need to use a java long variable to store bitmask, all its 64 bits are used. But in a step I need to convert the long variable to a double variable and then convert it back, because other people's api only supports double. What I don't understand is that both java long and double variables have 64 bits size, a long variable use all its 64 bit to store a decimal number, but besides the decimal portion, a double variable still need to store the exponential potion, so some information may be lost when convert a long to a double. Can anyone tell me is my bitmask safe when it is converted to a double and converted back? Thank you.
No. A 'double' has 53 bits for the mantissa so you are in danger of losing up to 11 bits of precision from your 64-bit 'long'.
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