You didn't specify enough room for the numbers (see, for instance:
printf - C++ Reference[
^]).
Replace
Quote:
printf("Fahrenheit Celsius Kelvin \n---------------------------------------------\n%0.0f %0.2f %0.2f\n", Fahrenheit, Celsius, Kelvin);
with
printf("Fahrenheit Celsius Kelvin \n---------------------------------------------\n %4.0f %7.2f %7.2f\n", Fahrenheit, Celsius, Kelvin);