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floating-point infinity

The special float value meaning "bigger than any number", produced by overflow or by dividing a nonzero number by zero.

+inf and -inf have an all-ones exponent field and a zero fraction; they result from overflow under round-to-nearest and from x / 0 for nonzero x, and arithmetic on them follows the limits of real arithmetic where defined.

Examples

  • +∞ in binary32 is 0x7F800000: an all-ones exponent and a zero fraction. 1.0 / 0.0 gives it.

See also

NaN exponent field rounding mode
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