Precision states the difference between float and double data type.
Float is a single precision (32 bit) floating point data type.
Double is a double precision (64 bit) floating point data type.
Range of a float type −
-3.4 x 1038 to + 3.4 x 1038
Range of a double type is −
(+/-)5.0 x 10-324 to (+/-)1.7 x 10308
Default value of a float type −
0.0F
Default value of a double type −
0.0D