Java运算符优先级表达式评估

Question

I have the following variable decelrations, assignments and variable declerations

variable e is an expression statement which should return the value of the evaulated variables in the expression;

What is the order of precdence of the opperators in the e variable?

Computed it equals = 60;

With a calculator I get 422;

int a, b, c, d;

a = 10;
b = 2;
c = 1;
d = 20;

e = a + b * d / c + a + b / d;


e = 10 + 2 * 20 / 1 + 10 + 2 / 20;

e = 60;

Answer 1

Actually the answer is 60.1 but since variables are int its showing 60 . It is happening as below

10 + (2 * (20 / 1)) + 10 + (int)(2 / 20) = 10 + (2 * 20) + 10 + (int)0.1
= 10 + 40 + 10 + 0 = 60

Answer 2

Here is a link outlining operator precedence. As for your result, this can also be attributed to integer division (which takes the floor of the result; for instance, 2/20 = 0 ).

Answer 3

Just like in school, multiplication and division have priority over addition. So you have:

10 + 2 * 20 / 1 + 10 + 2 / 20 = 10 + 40 + 10 + 0 = 60

Answer 4

* takes first precedence so first, 2*20 =40,  10 + 40 / 1 + 10 + 2 / 20;
/ takes precedence so ,  10 + 40 + 10 + 0;
+ takes precedence so, 60

Here is link for operator precedence: Operator precedence