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在头文件<complex.h>中定义



float complex       csinf( float complex z );

(1)

(自 C99)

double complex      csin( double complex z );

(2)

( 自 C99)

long double complex csinl( long double complex z );

(3)

( 自 C99)

在头文件<tgmath.h>中定义



#define sin( z )

(4)

( 自C99)

1-3）计算z的复数正弦值。

4）类型通用宏：如果z具有类型long double complex，则调用csinl。 如果z具有类型double complex，则调用csin，如果z具有类型float complex，则调用csinf。 如果z是实数或整数，则宏调用相应的实函数（sinf，sin，sinl）。 如果z是虚构的，则宏调用相应的实函数sinh，实现公式sin（iy）= i sinh（y），并且宏的返回类型是虚数。

参数

z

-

complex argument

返回值

如果没有错误发生，则返回z的复数正弦。

错误和特殊情况的处理就像操作由-I * csinh（I * z）实现一样。

注意

正弦是复杂平面上的一个完整功能，并且没有分支切割。正弦的数学定义是sin z =

| eiz-e-iz |

|:----|

| 2i |

例

#include <stdio.h>#include <math.h>#include <complex.h>
 int main(void){
    double complex z = csin(1);  // behaves like real sine along the real line    printf("sin(1+0i) = %f%+fi ( sin(1)=%f)\n", creal(z), cimag(z), sin(1));
 
    double complex z2 = csin(I); // behaves like sinh along the imaginary line     printf("sin(0+1i) = %f%+fi (sinh(1)=%f)\n", creal(z2), cimag(z2), sinh(1));}

输出：

sin(1+0i) = 0.841471+0.000000i ( sin(1)=0.841471)sin(0+1i) = 0.000000+1.175201i (sinh(1)=1.175201)

参考

  • C11标准（ISO / IEC 9899：2011）：

    • 7.3.5.5 csin函数（p：191-192）

    • 7.25类型通用数学<tgmath.h>（p：373-375）

    • G.7类型 - 通用数学<tgmath.h>（p：545）

  • C99标准（ISO / IEC 9899：1999）：

    • 7.3.5.5 csin函数（p：173）

    • 7.22类型通用数学<tgmath.h>（p：335-337）

    • G.7类型 - 通用数学<tgmath.h>（p：480）

扩展内容

ccosccosfccosl (C99)(C99)(C99)

计算复余弦（函数）

ctanctanfctanl (C99)(C99)(C99)

计算复正切（函数）

casincasinfcasinl（C99）（C99）（C99）

计算复反正弦（函数）

sinsinfsinl（C99）（C99）

计算正弦（sin（x））（函数）

| 用于sin的C ++文档 |

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