30

Today we worked on tracing cod (loops). some outputs came out to be strange, like #6 :

-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
-9 -8 -7 -6 -5 -4 -3 -2 -1 0
-8 -7 -6 -5 -4 -3 -2 -1 0 1
-7 -6 -5 -4 -3 -2 -1 0 1 2
-6 -5 -4 -3 -2 -1 0 1 2 3
-5 -4 -3 -2 -1 0 1 2 3 4
-4 -3 -2 -1 0 1 2 3 4 5
-3 -2 -1 0 1 2 3 4 5 6
-2 -1 0 1 2 3 4 5 6 7
-1 0 1 2 3 4 5 6 7 8