When the shorthand method is not to be used for assignment operators in C/C++?

Question

As there are two syntax for same instruction there must be drawback to any one of them. Can anybody explain that?

Answer 1

Which language and which "instructions" you are talking about?

Answer 2

It is still unclear. Can you please say what are the 2 syntaxes you are referring to?

Answer 3

x += (some + very(long)) / expression

is easier to read and understand than

x = x + (some + very(long)) / expression

It might also be more efficient on some compilers.

But mostly it is for looks. "x =" means "replace x" and "x +=" means "modify x".

Answer 4

I have updated the question.
https://www.sololearn.com/discuss/1836414/?ref=app

Answer 5

x+=4;
x=x+4;
The two syntax above are performing same instruction. So what is the merits and drawback of using an alternate method(x+=4)?