Grados de 300 a 0f utilizando While

#include <stdio.h>

#include <stdlib.h>

/* convertir fahrenheit a celsius utilizando While, de 300 a 0 f, */

int main()

{

float fahr, celsius;

fahr = 300;

        while (fahr >= 0)

{
          printf("%3.0f%8.1f\n", fahr, celsius = (5.0/9.0)*(fahr-32.0));
        fahr = fahr - 20.0;
    }
}