/* Once we've got a counting function, it is easy
   to extend it to other purposes. This is our
   program for making centigrade to fahrenheit
   conversion tables */

#include "library.h"

void convert_to_fahrenheit(double c)
{ print(c);
  print(" degrees C is ");
  print(c/5*9+32);
  print(" degrees F");
  new_line(); }

void count_from_to(double start, double end, double c)
{ if (start<=end) 
  { if (c<=end)
    { convert_to_fahrenheit(c);
      count_from_to(start, end, c+1); } }
  else
  { if (c>=end)
    { convert_to_fahrenheit(c);
      count_from_to(start, end, c-1); } } }

void main()
{ count_from_to(10, 30, 10); }

/* At the very end of class I made an editing mistake.
   When I wanted to make it run from 19 to 21 in steps
   of 0.1, I changed to call in main to
               count_from_to(19, 21, 0.1);
   which was just careless. The 0.1 should have been 19.
   it is the c+1 and the c-1 in the function definition
   that should have been changed to c+0.1 and c-0.1 */