remainder(3) - NetBSD Manual Pages

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REMAINDER(3)            NetBSD Library Functions Manual           REMAINDER(3)

remainder, remainderf, remainderl, remquo, remquof, remquol -- remainder functions
Math Library (libm, -lm)
#include <math.h> double remainder(double x, double y); float remainderf(float x, float y); long double remainderl(long double x, long double y); double remquo(double x, double y, int *quo); float remquof(float x, float y, int *quo); long double remquol(long double x, long double y, int *quo);
Provided that y != 0 , the remainder() remainderf() and remainderl() functions calculate the floating-point remainder r of r = x - ny, where n is the integral value nearest to the exact value of x / y. If | n - x / y | = 1/2 , the value n is chosen to be even. Consequently, the remainder is com- puted exactly and | r | <= | y | / 2 . Also the remquo() remquof() and remquol() functions calculate the remain- der as described above. But these additionally use quo to store a value whose sign is the sign of x / y and whose magnitude is congruent modulo 2^k to the magnitude of the integral quotient of x / y, where k is an implementation-defined integer greater than or equal to 3. The rationale of the remquo() family of functions relates to situations where only few bits of the quotient are required. The exact representa- tion of the quotient may not be meaningful when x is large in magnitude compared to y.
The functions return the remainder independent of the rounding mode. If y is zero , NaN is returned and a domain error occurs. A domain error occurs and a NaN is returned also when x is infinite but y is not a NaN. If either x or y is NaN, a NaN is always returned.
div(3), fast_remainder32(3), fmod(3), math(3)
The described functions conform to ISO/IEC 9899:1999 (``ISO C99''). NetBSD 10.99 January 24, 2024 NetBSD 10.99
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