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Is there any in built function in java to tell me how many decimal places in a double. For example:
101.13 = 2
101.130 = 3
1.100 = 3
1.1 = 1
-3.2322 = 4 etc.
I am happy to convert to another type first if needed, I have looked at converting to bigdecimal first with no luck.
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double is a 64-bit IEEE 754 double precision Floating Point Number – 1 bit for the sign, 11 bits for the exponent, and 52* bits for the value. double has 15 decimal digits of precision.
This is possible to do because a float value can hold only a maximum of 7 digits after the decimal, while a double value in Java can hold a maximum of 16 digits after the decimal.
Double data type stores decimal values with 15-16 digits of precision. The default value is 0.0d; this means that if you do not append f or d to the end of the decimal, the value will be stored as a double in Java.
double: The double data type is a double-precision 64-bit IEEE 754 floating point. Its range of values is beyond the scope of this discussion, but is specified in the Floating-Point Types, Formats, and Values section of the Java Language Specification.
The number of decimal places in a double is 16.
64-bit numbers. 52-bit Mantissa. 52 bits is about 16 decimal digits.
See http://java.sun.com/docs/books/jls/second_edition/html/typesValues.doc.html.
double, whose values include the 64-bit IEEE 754 floating-point numbers.
See http://en.wikipedia.org/wiki/IEEE_754-2008
169
No.
1.100 and 1.1 are exactly the same value (they are represented exactly the same bit-for-bit in a double).
Therefore you can't ever get that kind of information from a double.
The only thing you can do is to get the minimum number of decimal digits necessary for a decimal number to be parsed into the same double value. And that is as easy as calling Double.toString() and checking how many decimal digits there are.
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