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  1. /* Listing 2b. Tests sin_4() */
  2. typedef struct {
  3.     double X1, X2, X3, X4;
  4. }      ARG_D_4;            /* vector 4 */
  5. ARG_D_4 sin_4();
  6. #include <math.h>
  7. main(){
  8.     ARG_D_4 res;
  9.     res=sin_4(-2.,-1.,1.,2.);
  10.     printf(
  11. "\t%.17g\t%.17g\n\t%.17g\t%.17g\n\t%.17g\t%.17g\n\t%.17g\t%.17g\n",
  12.         res.X1,sin(-2.),
  13.         res.X2,sin(-1.),
  14.         res.X3,sin(1.),
  15.         res.X4,sin(2.));
  16. }
  17.