Something

/* print Fahrenheit-Celsius table
     for f = 0, 20, ..., 300 */


     main()
     {
           printf(" A working Fahrenheit-Celsius table\n");
           int lower, upper, step;
           float fahr, celsius;

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

           fahr = lower;
           while (fahr <= upper) {
                celsius = (5.0/9.0) * (fahr-32.0);
                printf("%4.0f %6.1f\n", fahr, celsius);
                fahr = fahr + step;

           }
}