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STACK ADT

STACK ADT. By Pantharee S. Stack Model . A list with the restriction that insertions deletions can be performed in only one position (LIFO) Push – insert into stack. Pop – deletes the most recently inserted element. Push and Pop on an empty stack is ERROR in stack ADT

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STACK ADT

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  1. STACK ADT By Pantharee S.

  2. Stack Model • A list with the restriction that insertions deletions can be performed in only one position (LIFO) • Push – insert into stack. • Pop – deletes the most recently inserted element. • Push and Pop on an empty stack is ERRORin stack ADT • Push on the running out of space is implementation error but not an ADT error

  3. Stack

  4. Operations

  5. Postfix Expressions • When a number is seen • It is pushed onto the stack • When an operator is seen • POP two numbers(symbols) from the stack and plly the operator on them. • Push the result onto the stack.

  6. Example 6 5 2 3 + 8 * + 3 + *

  7. จงบอกผลการทำงานจากบนลงล่างจงบอกผลการทำงานจากบนลงล่าง • Push(A) A. A • Push(B) B. B • Push(C) C. C • Pop D. D • Push(D) E. Void • Pop • Pop

  8. ข้อใดทำการ push(e) • A. elementData[--size] = e; • B. elementData[size--] = e; • C. elementData[++size] = e; • D. elementData[size++] = e;

  9. ข้อใดทำการ pop() • A. elementData[--size] = null; • B. elementData[size--] = null; • C. elementData[++size] = null; • D. elementData[size++] = null;

  10. จงแสดงวิธีหาผลลัพธ์ของสมการ Postfix ดังต่อไปนี้ โดยใช้ Stack 3 4 5 * + 7 8 * 6 + 5 * +

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