kdbg/testprogs/maths.cpp

   1 // do some floatingpoint computations
   2 #include <math.h>
   3 #include <stdio.h>
   4
   5 double deg2rad(double a)
   6 {
   7         double result;
   8         result = a * 3.141592653589793 / 180.0;
   9         return result;
  10 }
  11
  12 #define pi  3.1415926535897932384626433832795028841971693993750
  13
  14 void longdouble(long double ld)
  15 {
  16         long double x = 1000000.0 * ld*ld*pi;
  17         printf("long double: %Lf\n", x);
  18 }
  19
  20 int main(int argc, char** argv)
  21 {
  22         double a = 17.4;
  23         double b = deg2rad(a);
  24         double sine = sin(b);
  25
  26         printf("angle=%f degrees (%f radians), sine is %f\n",
  27                 a, b, sine);
  28
  29         longdouble(17.0);
  30 }