Question

用C语言编写计算三角函数的程序

Answer 1

math.h里的三角函数用的单位是弧度，你貌似错在这里。 答案补充 Example

/* SINCOS.C: This program displays the sine, hyperbolic
* sine, cosine, and hyperbolic cosine of pi / 2.
*/

#include <math.h>
#include <stdio.h>

void main( void )
{
double pi = 3.1415926535;
double x, y;

x = pi / 2;
y = sin( x );
printf( "sin( %f ) = %f\n", x, y );
y = sinh( x );
printf( "sinh( %f ) = %f\n",x, y );
y = cos( x );
printf( "cos( %f ) = %f\n", x, y );
y = cosh( x );
printf( "cosh( %f ) = %f\n",x, y );
} 答案补充 Output

sin( 1.570796 ) = 1.000000
sinh( 1.570796 ) = 2.301299
cos( 1.570796 ) = 0.000000
cosh( 1.570796 ) = 2.509178

Parameter

x

Angle in radians