i dont understand the answer again please help

Question

Question is
var a = 0
let b = ++a
let c = a++
Print("\(a) \(b) \(c)")
I know let b and let c the different is 0+1 and 1+0
But i don't understand why var a will convert to 2
Is it b plus c? so var a = b plus c ?
Thanks guys for help

Answer 1

a=0
b = ++a
writing this you are saying that you want to increment a (a becomes 0+1=1) and then assign his value to b (b becomes 1)

c = a++
here you are first assigning to c the value of a (c becomes 1) and then incrementing a (a becomes 2)

so at the end you have
a=2, b=1, c=1