I guess 4.39 * 100 becomes 438.9999999999

...

What can I do to get the int be right?

What do you mean, "get it right"? Do you want int(438.9999999999) to return something else than 438?

If you're using int to round to the nearest integer, you're doing it wrong. That's not what int does - int rounds towards 0. Use (s)printf instead.