C++ Stack Exercises: Sort the stack (using a vector) elements

Last update on April 14 2025 12:47:59 (UTC/GMT +8 hours)

25. Sort the Elements of a Vector-Based Stack

Write a C++ program that sorts the stack (using a vector) elements.

Test Data:
Create a stack object:
Input and store (using vector) some elements onto the stack:
Stack elements are: 1 3 2 6 5 -1 0
Sort the stack items in ascending order:
Stack elements are: -1 0 1 2 3 5 6

Sample Solution:

C++ Code:

#include <iostream>
#include <vector>
#include <algorithm> // Required for using sort() function

using namespace std;

class Stack {
private:
    vector<int> elements; // Vector to store elements

public:
    // Function to push an element onto the stack
    void push(int element) {
        elements.push_back(element); // Add element to the end of the vector
    }

    // Function to pop an element from the stack
    void pop() {
        if (elements.empty()) {
            cout << "Stack is full" << endl; // Display full message if the stack is empty
        } else {
            elements.pop_back(); // Remove the last element from the vector
        }
    }

    // Function to get the top element of the stack
    int top() {
        if (elements.empty()) {
            cout << "Stack is empty" << endl; // Display empty message if the stack is empty
            return 0;
        } else {
            return elements.back(); // Return the last element in the vector
        }
    }

    // Function to check if the stack is empty
    bool empty() {
        return elements.empty(); // Check if the vector is empty
    }

    // Function to sort elements of the stack in ascending order
    void sort_elements() {
        if (elements.empty()) {
            cout << "Stack is empty" << endl; // Display empty message if the stack is empty
            return;
        }
        sort(elements.begin(), elements.end()); // Sort elements in ascending order
    }

    // Function to display the elements of the stack
    void display() {
        vector<int> v = elements;
        if (v.empty()) {
            cout << "Stack is empty" << endl; // Display empty message if the stack is empty
            return;
        }
        cout << "Stack elements are: ";
        for (int i = 0; i < v.size(); i++) {
            cout << v[i] << " "; // Display the elements of the stack
        }
        cout << endl;
    }
};

int main() {
    Stack stack;
    cout << "Create a stack object:\n"; // Initialize a stack
    cout << "\nInput and store (using vector) some elements onto the stack:\n";
    stack.push(1);
    stack.push(3);
    stack.push(2);
    stack.push(6);
    stack.push(5);
    stack.push(-1);
    stack.push(0);
    stack.display();
    cout << "\nSort the stack items in ascending order:\n";
    stack.sort_elements();
    stack.display();
    cout << "\nRemove two elements from the stack:\n";
    stack.pop();
    stack.pop();
    stack.display();
    cout << "\nInput three elements onto the stack:\n";
    stack.push(4);
    stack.push(7);
    stack.push(-2);
    stack.display();
    cout << "\nSort the said items in ascending order:\n";
    stack.sort_elements();
    stack.display();
    return 0;
}

Sample Output:

Create a stack object:

Input and store (using vector) some elements onto the stack:
Stack elements are: 1 3 2 6 5 -1 0

Sort the stack items in ascending order:
Stack elements are: -1 0 1 2 3 5 6

Remove two elements from the stack:
Stack elements are: -1 0 1 2 3

Input three elements onto the stack:
Stack elements are: -1 0 1 2 3 4 7 -2

Sort the said items in ascending order:
Stack elements are: -2 -1 0 1 2 3 4 7

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to sort a vector-based stack in ascending order using the STL sort algorithm.
• Develop a C++ program that implements a vector-based stack and rearranges its elements in sorted order.
• Design a C++ program to create a stack using vectors and sort its elements while preserving the original order.
• Implement a C++ program to manage a stack using vectors and apply a custom sorting algorithm to its elements.

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Previous C++ Exercise: Implement a stack using a vector with push, pop operations.
Next C++ Exercise: Reverse a stack (using a vector) elements.