How many elements are in the stack after the following code executes? (The stack is initially empty.) stack.push(23); stack.push(9); stack.pop();
How many elements are in the stack after the following code executes? (The stack is initially empty.) stack.push(23); stack.push(9); stack.pop();
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Java
![**Exercise: Stack Operations**
**Question:**
How many elements are in the stack after the following code executes? (The stack is initially empty.)
```csharp
stack.push(23);
stack.push(9);
stack.pop();
stack.push(14);
stack.push(3);
stack.push(stack.pop());
stack.push(stack.peek());
stack.push(17);
stack.push(8);
stack.pop();
stack.peek();
```
**Solution:**
Analyze the sequence of operations to determine the final count of elements in the stack.
1. `stack.push(23);` - Stack: [23]
2. `stack.push(9);` - Stack: [23, 9]
3. `stack.pop();` - Stack: [23]
4. `stack.push(14);` - Stack: [23, 14]
5. `stack.push(3);` - Stack: [23, 14, 3]
6. `stack.push(stack.pop());` - Pops 3, pushes 3 - Stack: [23, 14, 3]
7. `stack.push(stack.peek());` - Peeks 3, pushes 3 - Stack: [23, 14, 3, 3]
8. `stack.push(17);` - Stack: [23, 14, 3, 3, 17]
9. `stack.push(8);` - Stack: [23, 14, 3, 3, 17, 8]
10. `stack.pop();` - Stack: [23, 14, 3, 3, 17]
11. `stack.peek();` - Stack remains: [23, 14, 3, 3, 17]
**Final Count:** 5 elements in the stack.
Use this exercise to understand and practice the stack operations `push`, `pop`, and `peek`, and how they affect the stack's state.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7024c4db-e4c4-44c2-8fab-3045baf15ef1%2F82bd2698-2e06-423b-ab3a-f58ee6e5c260%2F2qpvr0n_processed.png&w=3840&q=75)
Transcribed Image Text:**Exercise: Stack Operations**
**Question:**
How many elements are in the stack after the following code executes? (The stack is initially empty.)
```csharp
stack.push(23);
stack.push(9);
stack.pop();
stack.push(14);
stack.push(3);
stack.push(stack.pop());
stack.push(stack.peek());
stack.push(17);
stack.push(8);
stack.pop();
stack.peek();
```
**Solution:**
Analyze the sequence of operations to determine the final count of elements in the stack.
1. `stack.push(23);` - Stack: [23]
2. `stack.push(9);` - Stack: [23, 9]
3. `stack.pop();` - Stack: [23]
4. `stack.push(14);` - Stack: [23, 14]
5. `stack.push(3);` - Stack: [23, 14, 3]
6. `stack.push(stack.pop());` - Pops 3, pushes 3 - Stack: [23, 14, 3]
7. `stack.push(stack.peek());` - Peeks 3, pushes 3 - Stack: [23, 14, 3, 3]
8. `stack.push(17);` - Stack: [23, 14, 3, 3, 17]
9. `stack.push(8);` - Stack: [23, 14, 3, 3, 17, 8]
10. `stack.pop();` - Stack: [23, 14, 3, 3, 17]
11. `stack.peek();` - Stack remains: [23, 14, 3, 3, 17]
**Final Count:** 5 elements in the stack.
Use this exercise to understand and practice the stack operations `push`, `pop`, and `peek`, and how they affect the stack's state.
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