C++ Stack Exercises: Check if the stack (using an array) is full

C++ Stack: Exercise-2 with Solution

Write a C++ program to implement a stack using an array with push and pop operations. Check if the stack is full.

Test Data:
MAX_SIZE of the array: 5
Insert some elements onto the stack:
Stack elements: 1 2 5 6 9
Is the stack full? 1

Sample Solution:

C++ Code:

#include <iostream>

using namespace std;
#define MAX_SIZE 5 // Maximum size of stack
class Stack {
private:
    int top; // Index of top element
    int arr[MAX_SIZE]; // Array to store elements
public:
    Stack() {
        top = -1; // Initialize top index to -1 (empty stack)
    }

    bool push(int x) {
        if (isFull()) {
            cout << "Stack overflow" << endl;
            return false;
        }
        arr[++top] = x; // Increment top index and add element to array
        return true;
    }

    int pop() {
        if (isEmpty()) {
            cout << "Stack underflow" << endl;
            return 0;
        }
        return arr[top--]; // Return top element and decrement top index
    }

    int peek() {
        if (isEmpty()) {
            cout << "Stack is empty" << endl;
            return 0;
        }
        return arr[top]; // Return top element without modifying top index
    }

    bool isEmpty() {
        return (top < 0); // Stack is empty if top index is -1
    }

    bool isFull() {
        return (top >= MAX_SIZE - 1); // Stack is full if top index is equal to MAX_SIZE - 1
    }

void display() {
    if (top < 0) {
        cout << "Stack is empty" << endl;
        return;
    }
    cout << "\nStack elements: ";
    for (int i = top; i >= 0; i--)
        cout << arr[i] << " ";
    cout << endl;
  }
};
int main() {
	cout << "MAX_SIZE of the array: " << MAX_SIZE;
	//Initialize a stack 
    Stack s; 
    cout << "\nInsert some elements onto the stack:\n";
    s.push(9); 
    s.push(6);
    s.push(5);
    s.push(2);
    s.push(1);
    s.display();
    cout << "Is the stack full? " << s.isFull() << endl; // Check if the stack is full
    cout << "\nRemove an element from the stack! ";
    cout << s.pop(); // Pop an element from the stack
    s.display();
    cout << "Is the stack full? " << s.isFull() << endl; // Check if the stack is full
    cout << endl;
    return 0;
}

Sample Output:

MAX_SIZE of the array: 5
Insert some elements onto the stack:

Stack elements: 1 2 5 6 9
Is the stack full? 1

Remove an element from the stack! 1
Stack elements: 2 5 6 9
Is the stack full? 0

Flowchart:

CPP Code Editor:

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Previous C++ Exercise: Implement a stack using an array with push, pop operations.
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