What's happening with this expression? b = a + (a = a + 5)

Question

a = 5
b = a + (a = a + 5)

result b = 15

Why the first \'a\' do not changes after that (a = a + 5)? But why second one changes? What exactly is

Answer 1

We always work left to right the Parens just group parts of the sum.So just remember always go left to right. I have gone step by step below

start with the question

a = 5

b = a + (a = a + 5)

So now change the first 'a' to a 5

b = 5 + (a = a + 5)

now lets do the sum in the parens

b = 5 + (a = 5 + 5)

This gives us

b = 5 + 10 or you could say b = 5 + (a = 10)

and the answer is

b = 15

also now

a = 10