A. Imagine we have two empty stacks of integers, s1 and s2. Draw a picture of each stack after the following operations:

pushStack (s1, 3)

pushStack (s1, 5)

pushStack (s1, 7)

pushStack (s1, 9)

pushStack (s1, 11)

pushStack (s1, 13)

loop not emptyStack (s1) 1 popStack (s1, x) 2 popStack (s1, x) 3 pushStack (s2, x)

8. end loop

B. Change the following infix expressions to postfix expressions using the algorithmic method (a stack)

(A + B) * C D * F + C