Floating-point literals can take any of the following forms:
{-}digitsE{-}digits{-}{digits}.digits{-}{digits}.digitsE{-}digits0xhexdigits&hexdigits0f_hexdigits0d_hexdigits
where:
digitsAre sequences of characters using only the digits 0 to 9. You can write
Ein uppercase or lowercase. These forms correspond to normal floating-point notation.hexdigitsAre sequences of characters using only the digits 0 to 9 and the letters A to F or a to f. These forms correspond to the internal representation of the numbers in the computer. Use these forms to enter infinities and NaNs, or if you want to be sure of the exact bit patterns you are using.
The 0x and & forms
allow the floating-point bit pattern to be specified by any number
of hex digits.
The 0f_ form requires the floating-point
bit pattern to be specified by exactly 8 hex digits.
The 0d_ form requires the floating-point
bit pattern to be specified by exactly 16 hex digits.
The range for single-precision floating-point values is:
maximum 3.40282347e+38
minimum 1.17549435e-38.
The range for double-precision floating-point values is:
maximum 1.79769313486231571e+308
minimum 2.22507385850720138e-308.
Floating-point numbers are only available if your system has VFP, or NEON with floating-point.
Examples
DCFD 1E308,-4E-100
DCFS 1.0
DCFS 0.02
DCFD 3.725e15
DCFS 0x7FC00000 ; Quiet NaN
DCFD &FFF0000000000000 ; Minus infinity
- Concepts
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