After a string literal, all the + will be treated as string concatenation operator why? [duplicate]

Answer 1

Addition is left associative. let's see it step by step

10+30+" Sachin "+40+40
-----           -------
40 +" Sachin "+40+40    <--- here both operands are integers with the + operator, which is addition
---
"40 Sachin "+40+40   <--- + operator on integer and string results in concatenation
-----------
"40 Sachin 40"+40   <--- + operator on integer and string results in concatenation
--------------
"40 Sachin 4040"   <--- + operator on integer and string results in concatenation
-----------------