/******************/
/* playing around */
/******************/

/**************************************************************
 *
 *  New syntax:    the "while" loop
 *  New #include:  math.h has sin, cos, and so on.
 *  New %.42g in printf format means "print 42 digits after decimal"
 *  New funky form for this (long) comment - but it's still a bunch of
 *     stuff between the "start comment" / *  and "end comment" * /
 *     (I left spaces there so those wouldn't stop this comment...)
 *
 *  Note the indentation of stuff within main(){ vs stuff in while(){
 *  loop - this helps you see what's what.
 *
 *  Note also the use of the constants XMAX and XMIN, rather than
 *  "hard coding" those into the middle of the program.  This is 
 *  good form and helps you see what's what.  People typically 
 *  use ALL_CAPITALS for constants (things that won't change) and 
 *  lower_case for things that will.  But be clear that This and 
 *  THIS and tHis are all different variables in C ...
 *
 *  Are we having fun yet?
 *
 ***************************************************************/

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

main() {
  double x,y,dx;

  double XMIN =  0.0;
  double XMAX = 10.0;

  /* --------- read inputs ----------- */
  printf(" dx = ? ");
  scanf("%lf", &dx);
  printf(" OK, dx = %g \n", dx);

  /* --------- loop over x  --------- */
  x = XMIN;
  while ( x < XMAX ) {
    y = sin(x);
    printf(" x = %g, sin(x) = %.42g \n", x, y);
    x = x + dx;
  }

  printf(" Done \n ");
}