Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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3.4 Queue via Stacks: Implement a MyQueue class which implements a queue using two stacks.
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- 130-4arrow_forward130-3arrow_forwardProject Overview: This project is for testing the use and understanding of stacks. In this assignment, you will be writing a program that reads in a stream of text and tests for mismatched delimiters. First, you will create a stack class that stores, in each node, a character (char), a line number (int) and a character count (int). This can either be based on a dynamic stack or a static stack from the book, modified according to these requirements. I suggest using a stack of structs that have the char, line number and character count as members, but you can do this separately if you wish.Second, your program should start reading in lines of text from the user. This reading in of lines of text (using getline) should only end when it receives the line “DONE”.While the text is being read, you will use this stack to test for matching “blocks”. That is, the text coming in will have the delimiters to bracket information into blocks, the braces {}, parentheses (), and brackets [ ]. A string…arrow_forward
- Change the __str__ method of the Queue class (provided below) so that it prints each object in the queue along with its order in the queue (see sample output below). class Queue(): def __init__(self): self.queue = [] # implement with Python lists! # start of physical Python list == front of a queue # end of physical Python list == back of a queue def enqueue(self, new_obj): self.queue.append(new_obj); def dequeue(self): return self.queue.pop(0) def peek(self): return self.queue[0] def bad_luck(self): return self.queue[-1] def __str__(self): return str(self.queue) # let's try a more fun waySample output: >>> my_queue = Queue()>>> everyone = ["ESC", "ABC", "YOLO", "HTC"]>>> for initials in everyone:>>> my_queue.enqueue(initials)>>> print(my_queue)Output: 1: ESC2: ABC3: YOLO4: HTCarrow_forwardModify the C++ class for the abstract stack type shown belowto use a linked list representation and test it with the same code thatappears in this chapter. #include <iostream.h>class Stack {private: //** These members are visible only to other//** members and friends (see Section 11.6.4)int *stackPtr;int maxLen;int topSub;public: //** These members are visible to clientsStack() { //** A constructorstackPtr = new int [100];maxLen = 99;topSub = -1;}~Stack() {delete [] stackPtr;}; //** A destructorvoid push(int number) {if (topSub == maxLen)cerr << "Error in push--stack is full\n";else stackPtr[++topSub] = number;}void pop() {if (empty())cerr << "Error in pop--stack is empty\n";else topSub--;}int top() {if (empty())cerr << "Error in top--stack is empty\n";elsereturn (stackPtr[topSub]);}int empty() {return (topSub == -1);} }arrow_forwardComplete the code. The question is in the picture #include <iostream> using namespace std; class Queue { int size; int* queue; public: Queue() { size = 0; queue = new int[100]; } void add(int data) { queue[size] = data; size++; } void remove() { if (size == 0) { cout << "Queue is empty"<<endl; return; } else { for (int i = 0; i < size - 1; i++) { queue[i] = queue[i + 1]; } size--; } } void print() { if (size == 0) { cout << "Queue is empty"<<endl; return; } for (int i = 0; i < size; i++) { cout<<queue[i]<<" <- "; } cout << endl; } Queue operator+(Queue &obj) { Queue res; for(int i=0;i<this->size;i++) { res.add(this->queue[i]); } for(int i=0;i<obj.size;i++) { res.add(obj.queue[i]); } return res; } }; //your code goes here int main() { Queue q1; q1.add(42); q1.add(2); q1.add(8); q1.add(1); q1.print(); Queue2 q2; q2.add(3);…arrow_forward
- In C++,arrow_forward10.14 A CircularList is used in the implementation of QueueLists. Use Node with a head and tail reference to implement QueueLists in a time and space efficient manner. 10.15 Burger Death must keep track of all orders placed through the drive-through window. Create a data structure to help their ordering system.arrow_forward
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