"theTemperature* = 5/9" what is the difference between "theTemperature= theTemperature* 5/9"?

Question

Java

The bottom line is that when I write "theTemperature* = 5/9" it returns 0 for any value of the argument, and when I wrote "theTemperature= theTemperature* 5/9" - everything worked.

Answer 1

The difference is in the order of calculations.

int t = 20;
t = t * 5 / 9;
t *= 5 / 9;

In the first case, multiplication (20 * 5) is performed first, then division (100 / 9) - the result is 11.
In the second, (5 / 9) is first calculated, then 0 is multiplied by t.

Answer 2

theTemperature *= 5/9
So you multiply theTemperatureby the result of the integer division of 5 by 9.
Therefore, it will always be 0. 5 / 9