nearbyint

Return the rounded value of x based on the current rounding mode.

Interface Definition

C interface:

float nearbyintf(float x);

double nearbyint(double x);

Parameters

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

Return Value

The rounded value of x is returned. x ∈ (-INF, INF).
If the input is +0, the return value is +0.
If the input is -0, the return value is -0.
If the input is ±∞, the return value is ±∞.
If the input is NaN, the return value is NaN.

Dependencies

C: "km.h"

Examples

C interface:

    // typical usage
    double x1 = 0.0, x2 = -0.0, x3 = 1.5, x4 = -2.5;
    // special handling
    double a = INFINITY, b = -INFINITY, c = NAN;
    // nearbyint result
    printf("nearbyint(0.0) = %.15f\n", nearbyint(x1));
    printf("nearbyint(-0.0) = %.15f\n", nearbyint(x2));
    printf("nearbyint(1.5) = %.15f\n", nearbyint(x3));
    printf("nearbyint(-2.5) = %.15f\n", nearbyint(x4));
    printf("nearbyint(INFINITY) = %.15f\n", nearbyint(a));
    printf("nearbyint(-INFINITY) = %.15f\n", nearbyint(b));
    printf("nearbyint(NAN) = %.15f\n", nearbyint(c));
    /* 
     * nearbyint(0.0) = 0.000000000000000
     * nearbyint(-0.0) = -0.000000000000000
     * nearbyint(1.5) = 2.000000000000000
     * nearbyint(-2.5) = -2.000000000000000
     * nearbyint(INFINITY) = inf
     * nearbyint(-INFINITY) = -inf
     * nearbyint(NAN) = nan
     * */

Parent topic: Rounding Functions