**Document:** WG14 N1246

**Submitter:** Fred Tydeman (USA)

**Submission Date:** 2007-07-26

**Source:** WG14

**Version:** 1.0

**Date:** 2007-07-26

**Subject:** Unclear range of trig math functions

**Problem**

Section 7.12.4 Trigonometric functions is unclear in the
**Returns** section if the *pi* is mathematical or a
machine representation, and is unclear if the functions are
allowed or prohibited from returning a floating-point value
exceeding the specified range.

**Suggested change for C1x**

Add a paragraph to section 7.12.4 along the lines of:

TheReturnssections are in terms of ideal mathematical functions and mathematicalpi. But, due to, one or more of, machine representations of floating-point numbers, rounding, and implementation algorithms, the actual returned value may exceed the listed range.