If we do the following:
stack1 = {Apu, Jil, Ned, Bob, Ron}
stack2 = { }
while(!stack1.isEmpty())
stack2.push(stack1.pop());
stack1.push(stack2.pop());
stack2.pop();
stack1.push(stack2.pop());
What is the contents of stack1 and stack2?

Question

If we do the following:

stack1 = {Apu, Jil, Ned, Bob, Ron}

stack2 = { }

while(!stack1.isEmpty())

stack2.push(stack1.pop());

stack1.push(stack2.pop());

stack2.pop();

stack1.push(stack2.pop());

What is the contents of stack1 and stack2?

Answer

stack1 = {Ned, Ron}  and  stack2 = {Jil, Apu}

Answer

stack1 = {Ron, Bob}  and  stack2 = {Ned, Jil, Apu}

Answer

stack1 = {Ron, Ned}  and  stack2 = {Jil, Apu}

Answer

stack1 = {Apu, Ned}  and  stack2 = {Bob, Ron}

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