version 1 showing authors affecting page license.
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perry |
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RINT |
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!!!RINT |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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RETURN VALUE |
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ERRORS |
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NOTES |
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CONFORMING TO |
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SEE ALSO |
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---- |
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!!NAME |
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nearbyint, nearbyintf, nearbyintl, rint, rintf, rintl - round to nearest integer |
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!!SYNOPSIS |
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__#include |
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__ ''x''__); |
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float nearbyintf(float__ ''x''__); |
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long double nearbyintl(long double__ ''x''__); |
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double rint(double__ ''x''__); |
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float rintf(float__ ''x''__); |
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long double rintl(long double__ ''x''__); |
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__ |
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!!DESCRIPTION |
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The __nearbyint__ functions round their argument to an |
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integer value in floating point format, using the current |
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rounding direction and without raising the ''inexact'' |
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exception. |
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The __rint__ functions do the same, but will raise the |
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''inexact'' exception when the result differs in value |
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from the argument. |
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!!RETURN VALUE |
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The rounded integer value. If ''x'' is integral or |
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infinite, ''x'' itself is returned. |
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!!ERRORS |
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No errors other than EDOM and ERANGE can occur. If ''x'' |
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is NaN, then NaN is returned and ''errno'' may be set to |
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EDOM. |
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!!NOTES |
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The SUSv2 and Austin draft contain text about overflow |
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(which might set ''errno'' to ERANGE, or raise an |
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exception). In practice, the result cannot overflow on any |
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current machine, so this error-handling stuff is just |
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nonsense. (More precisely, overflow can happen only when the |
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maximum value of the exponent is smaller than the number of |
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mantissa bits. For the IEEE-754 standard 32-bit and 64-bit |
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floating point numbers the maximum value of the exponent is |
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128 (resp. 1024), and the number of mantissa bits is 24 |
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(resp. 53).) |
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!!CONFORMING TO |
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The __rint()__ function conforms to BSD 4.3. The other |
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functions are from C99. |
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!!SEE ALSO |
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ceil(3), floor(3), lrint(3), |
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nearbyint(3), round(3), |
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trunc(3) |
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---- |