drem

Compute the remainder of floating-point x/y.

That is, x = n * y + d, where n is an integer and |d| < y/2. When |d| = |y|/2, ensure that n is an even number.

Interface Definition

C interface:

float dremf(float x, float y);

double drem(double x, double y);

Parameters

Parameter	Type	Description	Input/Output
x	For dremf, x is of single-precision floating-point type. For drem, x is of double-precision floating-point type.	Floating-point value of the input data.	Input
y	For dremf, y is of single-precision floating-point type. For drem, y is of double-precision floating-point type.	Floating-point value of the input data.	Input

Return Value

Normal range: The remainder of x/y is returned.
Special range:
- If the input |x| or |y| is 0 or NaN, the output is NaN.
- If the input |x| is 0 and |y| is not 0 or NaN, the output is ±0.

Dependency

C: "km.h"

Example

C interface:

// typical usage
double x1 = 3.0, x2 = 3.5;
double y1 = 4.0, y2 = 4.5;
// special handling
double e = INFINITY, f = -INFINITY, g = NAN;
// print result
printf("/*\n");
printf(" * drem(3.0, 4.0) = %.15f\n", drem(x1, y1));
printf(" * drem(3.5, 4.5) = %.15f\n", drem(x2, x2));
printf(" * drem(4.5, 4.5) = %.15f\n", drem(y2, y2));
printf(" * drem(INFINITY, 0) = %.15f\n", drem(e, 0.0f));
printf(" * drem(-INFINITY, 3.0) = %.15f\n", drem(f, x1));
printf(" * drem(NAN, 3.0) = %.15f\n", drem(g, x1));
printf(" * drem(NAN, INFINITY) = %.15f\n", drem(g, e));
printf(" **/\n");
/*
 * drem(3.0, 4.0) = -1.000000000000000
 * drem(3.5, 4.5) = 0.000000000000000
 * drem(4.5, 4.5) = 0.000000000000000
 * drem(INFINITY, 0) = nan
 * drem(-INFINITY, 3.0) = nan
 * drem(NAN, 3.0) = nan
 * drem(NAN, INFINITY) = nan
 **/

Parent topic: Remainder Functions