sin

接口定义

C interface:

float sinf(float x);

double sin(double x);

Fortran interface:

RES = SINF(X);

RES = SIN(X);

参数

返回值

1. 返回弧度角 x 的正弦函数值 y，y ∈ [-1, +1]。
2. 输入+0，返回+0。
3. 输入-0，返回-0。
4. 输入±∞，返回 nan。
5. 输入 nan，返回 nan。

依赖

C: "km.h"

Fortran: "km.f03"

示例

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; 
    // 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 
    !