sin

Compute the sine of the input radian.

Interface Definition

C interface:

float sinf(float x);

double sin(double x);

long double sinl(long double x);

long double sinl_18(long double x);

sinl_18 is provided only in the high-precision version.

Fortran interface:

RES = SINF(X);

RES = SIN(X);

Parameters

Parameter	Type	Description	Input/Output
x	For sinf, x is of single-precision floating-point type. For sin, x is of double-precision floating-point type. For sinl and sinl_18, x is of long double-precision floating-point type.	Floating-point value of a radian angle.	Input

Return Value

The sine y of radian angle x is returned. y ∈ [-1, +1]
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 NaN.
If the input is NaN, the return value is NaN.

Dependencies

C: "km.h"

Examples

C interface:

    double pi = acos(-1); 
    // typical usage 
    double a = pi/6, b = 1.0, c = -3*pi/4, d = pi/3; 
    // special handling 
    double e = INFINITY, f = -INFINITY, g = NAN; 
    double complex k = 0 + 0 * I;
    // print result 
    printf("sin(pi/6) = %.15f\n", sin(a)); 
    printf("sin(1.0) = %.15f\n", sin(b)); 
    printf("sin(-3*pi/4) = %.15f\n", sin(c)); 
    printf("sin(pi/3) = %.15f\n", sin(d)); 
    printf("sin(INFINITY) = %.15f\n", sin(e)); 
    printf("sin(-INFINITY) = %.15f\n", sin(f)); 
    printf("sin(NAN) = %.15f\n", sin(g)); 
     /* 
     *  sin(pi/6) = 0.500000000000000 
     *  sin(1.0) = 0.841470984807897 
     *  sin(-3*pi/4) = -0.707106781186548 
     *  sin(pi/3) = 0.866025403784438 
     *  sin(INFINITY) = nan 
     *  sin(-INFINITY) = nan 
     *  sin(NAN) = nan 
     * 
     * */

Fortran interface:

    REAL(8) :: X = 1.0 
    PRINT*,  SIN(X) 
    ! 
    ! OUTPUT 
    !     0.841470984807897 
    !

Parent topic: Trigonometric Functions