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[QUOTE="Irrwahn Grausewitz, post: 1706764"]
Before calling other people idiots you certainly want to point out 
the differences (modulo comments and whitespace) between the following
two programs, the first of which was cut'n'pasted from OP's message, 
the second one being an exact copy of the _first_ example in section 
1.2 of K&R2:

---8<-------OP-------------------------------------------------

#include <stdio.h>

main()
{
    int fahr, celsius;
    int lower, upper, step;

lower = 0;
    upper = 300;
    step = 20;

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

---8<-------K&R2-----------------------------------------------

#include <stdio.h>

/* print Fahrenheit-Celsius table
   for fahr = 0, 20, ..., 300 */
main()
{
  int fahr, celsius;
  int lower, upper, step;
  lower = 0;      /* lower limit of temperature scale */
  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;
  }
}

---8<--------------------------------------------------------

Please report back if you find any substantial differences.

HTH
Regards

PS: I no longer own a working copy of K&R1 to cross-check, but as the 
    OP claimed he just bought the book, it's _extremely_ unlikely he's
    holding anything else but a copy the second edition.
[/QUOTE]

Verification