#include <stdio.h>

int main()
{float fahr, celsius;
  int lower, upper, step;
  lower = 0;
  upper = 300;
  step = 20;
  printf("  F     C\n\n");
  fahr = lower;
  while(fahr <= upper)
    {celsius = (5.0 / 9.0) * (fahr - 32.0);
      printf("%3.0f %6.1f\n", fahr, celsius);
      fahr = fahr + step;}
  return 0;}