7.12.10.2 The remainder functions

Synopsis

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#include <math.h>
double remainder(double x, double y);
float remainderf(float x, float y);
long double remainderl(long double x, long double y);

Description

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The remainder functions compute the remainder x REM y required by IEC 60559.[1]

Returns

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The remainder functions return x REM y. If y is zero, whether a domain error occurs or the functions return zero is implementation defined.

Footnotes

[1]

“When y != 0, the remainder r = x REM y is defined regardless of the rounding mode by the mathematical relation r = x - ny, where n is the integer nearest the exact value of x/y; whenever | n - x/y | = 1/2, then n is even. Thus, the remainder is always exact. If r = 0, its sign shall be that of x.’’ This definition is applicable for all implementations.