def to_celcius(to_convert):
    answer = (to_convert - 32) * 5 / 9
    return answer

def to_fahrenheit(to_convert):
    answer =  to_convert * 1.8 + 32
    return answer

to_c_test = [0,100,-459]
to_f_test = [0, 100, 40 -273]

for item in to_f_test:
    print("{} C is {:.0f} F".format(item, to_fahrenheit(item)))

print()

for item in to_c_test:
    print("{} C is {:.0f} F".format(item, to_celcius(item)))