[UNANSWERED ]Precedence

Question

Please give some material on operators' precedence or explain it.
How does basic arithmetic rules differ from program ones?
Like the arithmetic rule - the order of summands dont change the result but in Java string + int +int causes first concat, and due to this the second is also concat and the whole expression is a string.
Seems that multiplication and modulus have different precedence.

Answer 1

The plus(+) operator is used for string concatenation, along with its natural role (addition).
Its behaviour is defined as its position in the statement, example:
alert(5+6+"hello"+5+6);

The first plus sign will act naturally as addition operator, because its position is between 2 numbers, and the result is 11;
while the other + signs will append Everything after that resulting of string:
11hello56

Answer 2

I can't understand exactly what do you want.
You have to search some tutorials, like this:
https://www.javatpoint.com/operators-in-java

Answer 3

@$Baalbek$
This case was brought as an example. I want to know similar occasions which are abnormal in simple arithmetics.

Answer 4

Arithmetics: the order of operands when adding or subtracting is not important :"string"+10+20 according to arithmetical rules is string30
Coding : "string" +10+20 results in string1020
I want to know more of such stuff.