Math problem

[Fractal Cat]

Hi,

my problem is this:

double st;

st = 100 * sin(360 * (10000/23));

Now when my calculator is working in radians st is evaluated to 97% which is the value I'm after. When working in degrees it is approx -75% which is wrong. In Netbeans st is -75% like the wrong calculator value. How can I get 97% in Netbeans using the above formula?

What's wrong?

Any help appreciated.

FC.

[Daleth]

I'm pretty sure the standard(?) has all the trigonomic functions using radians. However, if need be, you can convert from radians to degrees and vice versa:

rad = deg*pi/180
deg = rad*180/pi

[wildblue]

Here's the example from the tutorial.
http://www.cplusplus.com/reference/cmath/sin/

/* sin example */
#include <stdio.h>      /* printf */
#include <math.h>       /* sin */

#define PI 3.14159265

int main ()
{
  double param, result;
  param = 30.0;
  result = sin (param*PI/180);
  printf ("The sine of %f degrees is %f.\n", param, result );
  return 0;
}

Using pi/180 instead of 360 in your example gave me a result of 96.1262.