#include <stdio.h>

#define LOWER 0
#define UPPER 300
#define STEP 20

float cels_of_fahr(float fahr);

int main()
{
    int fahr;

    printf("%3c %6c\n", 'F', 'C');
    for (fahr = LOWER; fahr <= UPPER; fahr = fahr + STEP)
        printf("%3d %6.1f\n", fahr, cels_of_fahr(fahr));
    return 0;
}

float cels_of_fahr(float fahr)
{
    return (5.0/9.0) * (fahr-32);
}