| |||

Home > Symbols, Literals, Expressions, and Operators > Floating-point literals |

Floating-point literals can take any of the following forms:

`{-}`

E{-}`digits`

`digits`

`{-}{`

}.digits`digits`

`{-}{`

}.digitsE{-}`digits`

`digits`

`0x`

`hexdigits`

`&`

`hexdigits`

`0f_`

`hexdigits`

`0d_`

`hexdigits`

where:

`digits`

Are sequences of characters using only the digits 0 to 9. You can write

`E`

in uppercase or lowercase. These forms correspond to normal floating-point notation.`hexdigits`

Are 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.

DCFD 1E308,-4E-100 DCFS 1.0 DCFS 0.02 DCFD 3.725e15 DCFS 0x7FC00000 ; Quiet NaN DCFD &FFF0000000000000 ; Minus infinity

- Concepts