Division on the fly [duplicate]

Answer 1

It's good practice, when you deal with doubles, to write code like this:

double Fahrenheit = 100.0;
double celsius = (Fahrenheit - 32.0) * (5.0 / 9.0);

Answer 2

Numbers are int by default in Java. So when you do 5/9, since they're both ints, you'll get 0.something, and since this is an int, only 0 will be stored. Solution:

double s = 5.0/9; //or 5d/9

Note that you can only explicitly cast one side, the other will be implicitly cast.

Now the calculation will be in a double manner and you'll get the desired result.

Answer 3

or you can do (5d/9d); // OR (5d/9) making 5 and 9 explicit double