Node:Floating point implementation, Next:Arrays and pointers implementation, Previous:Integers implementation, Up:C Implementation

### Floating point

- The accuracy of the floating-point operations and of the library functions in `<math.h>` and `<complex.h>` that return floating-point results (5.2.4.2.2).
- The rounding behaviors characterized by non-standard values of `FLT_ROUNDS` (5.2.4.2.2).
- The evaluation methods characterized by non-standard negative values of `FLT_EVAL_METHOD` (5.2.4.2.2).
- The direction of rounding when an integer is converted to a floating-point number that cannot exactly represent the original value (6.3.1.4).
- The direction of rounding when a floating-point number is converted to a narrower floating-point number (6.3.1.5).
- How the nearest representable value or the larger or smaller representable value immediately adjacent to the nearest representable value is chosen for certain floating constants (6.4.4.2).
- Whether and how floating expressions are contracted when not disallowed by the `FP_CONTRACT` pragma (6.5).
- The default state for the `FENV_ACCESS` pragma (7.6.1).
- Additional floating-point exceptions, rounding modes, environments, and classifications, and their macro names (7.6, 7.12).
- The default state for the `FP_CONTRACT` pragma (7.12.2).
- Whether the "inexact" floating-point exception can be raised when the rounded result actually does equal the mathematical result in an IEC 60559 conformant implementation (F.9).
- Whether the "underflow" (and "inexact") floating-point exception can be raised when a result is tiny but not inexact in an IEC 60559 conformant implementation (F.9).