programming_book_examples/the_c_programming_language/fahr_to_cels.c

#include <stdio.h>

/* print Fahrenheit-Celsius table
   for fahr = 0, 20 ..., 3000 */
main()
{
  int fahr, celsius;
  int lower, upper, step;

  lower = 0; /* lower limit of temperature table */
  upper = 300; /* upper limit */
  step = 20; /* step size */

  fahr = lower;
  while (fahr <= upper) {
      celsius = 5 * (fahr-32) / 9;
      printf("%d\t%d\n", fahr, celsius);
      fahr = fahr + step;
  }
}