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# 12.16 Syntax of floating-point literals

Floating-point literals consist of a sequence of characters evaluating to a floating-point number.

They can take any of the following forms:

• `{-}digitsE{-}digits`
• `{-}{digits}.digits`
• `{-}{digits}.digitsE{-}digits`
• `0xhexdigits`
• `&hexdigits`
• `0f_hexdigits`
• `0d_hexdigits`

where:

`digits `

Are sequences of characters using only the digits0 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 digits0 to 9 and the letters A to F or a to f. These forms correspondto the internal representation of the numbers in the computer. Usethese forms to enter infinities and NaNs, or if you want to be sure ofthe 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-pointbit pattern to be specified by exactly 8 hex digits.

The `0d_` form requires the floating-pointbit pattern to be specified by exactly 16 hex digits.

The range for half-precision floating-point values is:

• Maximum 65504 (IEEE format) or 131008 (alternative format).
• Minimum 0.00012201070785522461.

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 floating-point, Advanced SIMD 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`