Can someone please explain how does this code work?

Question

for(int a=1, b=1; b<8; a+=b, b=a-b){
System.out.print(a + " ");
}

Answer 1

start values:
a = 1
b = 1

condition when for loop ends:
b < 8

what happens with a and b:
a += b
b = a - b

1. a = 1, b = 1
print 1

2. a = 2, b = 1
print 2

3. a = 3, b = 2
print 3

4. a = 5, b = 3
print 5

5. a = 8, b = 5
print 8

6. a = 13, b = 8 -> end loop

Output:
1 2 3 5 8