Question

Assume a stack-oriented processor that includes the stack operations PUSH and POP. Arithmetic operations

automatically involve the top one or two stack elements. Begin with an empty stack. What stack elements remain after the
following instructions are executed?
O PUSH 9
O PUSH 6
O PUSH 3
O ADD
O PUSH 2
O SUB
O MUL

Answer 1

After executing the PUSH, ADD, SUB, and MUL operations on a stack-oriented processor, the remaining element on the stack is 63.

Step-by-step explanation:

College, subject: Computers and Technology. To determine what stack elements remain, we must follow each instruction in order:

• PUSH 9 adds 9 to the top of the stack.
• PUSH 6 adds 6 to the top of the stack.
• PUSH 3 adds 3 to the top of the stack.
• ADD pops the top two elements (6 and 3), adds them together (resulting in 9), and then pushes the result onto the stack.
• PUSH 2 adds 2 to the top of the stack.
• SUB pops the top two elements (9 and 2), subtracts the second from the first (resulting in 7), and then pushes the result onto the stack.
• MUL pops the top two elements (7 and 9), multiplies them (resulting in 63), and then pushes the result onto the stack.

After executing these instructions, the stack contains a single element: 63.