CSM217: C for Computer Scientists

#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 fahr */
 upper = 300; /* upper limit of fahr */
 step = 20;

 printf("Fahrenheit\tCelsius\n"); 
 for (fahr = upper; fahr >= lower; fahr -= step) { // -= does the job of fahr=fahr-step 
  celsius = 5 * (fahr - 32) / 9;
  printf("%d\t\t%d\n", fahr, celsius); /* %d is replaced by an integer
                                        \t represents a tab */
 }
}