Calculation rules

Question

System.out.println(12 % 9 * 12 % 9 * 12 % 9);

Do i calculated first the modulos or the *?

Answer 1

The precedence of these operators *, / and % is the same and so they are evaluated from right to left in an expression

12 % 9 * 12 % 9 * 12 % 9
So, here

12%9 = 3 would be evaluated first giving us
3 * 12 % 9 * 12 % 9

Then, 3*12 = 36 is evaluated giving us
36%9 * 12 % 9

Then, 36%9 = 0 will be evaluated giving us
0 * 12 % 9

Then, 0*12 = 0 is evaluated giving us
0 % 9

Finally we have 0 % 9 which is 0.

Read About order of PRECEDENCE in programming language.

Answer 2

Both % and * have the same precedence. In that case you must look for associativity, which is left to right in this case. So solve from left to right.