<P> Double - precision floating - point format is a computer number format that occupies 8 bytes (64 bits) in computer memory and represents a wide, dynamic range of values by using a floating point . </P> <P> Double - precision floating - point format usually refers to binary64, as specified by the IEEE 754 standard, not to the 64 - bit decimal format decimal64 . In older computers, different floating - point formats of 8 bytes were used, e.g., GW - BASIC's double - precision data type was the 64 - bit MBF floating - point format . </P> <Table> <Tr> <Th> Floating point precisions </Th> </Tr> <Tr> <Th> IEEE 754 </Th> </Tr> <Tr> <Td> <Ul> <Li> 16 - bit: Half (binary16) </Li> <Li> 32 - bit: Single (binary32), decimal32 </Li> <Li> 64 - bit: Double (binary64), decimal64 </Li> <Li> 128 - bit: Quadruple (binary128), decimal128 </Li> <Li> 256 - bit: Octuple (binary256) </Li> <Li> Extended precision formats (40 - bit or 80 - bit) </Li> </Ul> </Td> </Tr> <Tr> <Th> Other </Th> </Tr> <Tr> <Td> <Ul> <Li> Minifloat </Li> <Li> Microsoft Binary Format </Li> <Li> IBM Floating Point Architecture </Li> <Li> Arbitrary precision </Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table>

What is the default type for a floating point constant