C++ •Create a Stack class to perform ‘push’ and ‘pop’ operations. For the purpos

ID: 3825239 • Letter: C

Question

C++
•Create a Stack class to perform ‘push’ and ‘pop’ operations. For the purpose of this exercise, make the capacity to be 3
•Create a PushToFullStackException class, and a method called ‘what’ to return an overflow exception message. Provide code to throw and handle such an exception in this class.
• Create a PopEmptyStackException class, and a method called ‘what’ to return an underflow exception message. Provide code to throw and handle such an exception in this class.
•Use this test code

Stack myStk; //Capacity of 3

cout << "Popping right away.";

myStk.pop();

cout << " Pushing 1st item.";

myStk.push(1);

cout << " Pushing 2nd item.";

myStk.push(2);

cout << " Pushing 3rd item.";

myStk.push(3);

cout << " Pushing 4st item.";

Popping right away EXCEPTION: Your stack is empty Pushing 1st item Pushing 3rd item Pushing 4st item XCEPTION: Your stack is full

Explanation / Answer

#include <iostream>
using namespace std;
class PushToFullStackException
{
    public:
        PushToFullStackException()
        {
           message = "EXCEPTION: Your stack is full!";
        }
        PushToFullStackException(string msg)
        {
           message = msg;
        }
        string what()
        {
           return message;
        }
    private:
        string message;
};

class PopEmptyStackException
{
    public:
        PopEmptyStackException()
        {
           message = "EXCEPTION: Your stack is empty!";
        }
        PopEmptyStackException(string msg)
        {
           message = msg;
        }
        string what()
        {
           return message;
        }
    private:
        string message;
};

class Stack
{
    int array[3];
    int top;
    public:
        Stack()
        {
           top = -1;
        }
        void push(int value)
        {
           try
           {
              if(top == 3)
                  throw PushToFullStackException("EXCEPTION: Your stack is full!");
              top++;
              array[top] = value;
           }
           catch (PushToFullStackException& me)
           {
              std::cerr << me.what();
           }
        }
        int pop()
        {
           try
           {
              if(top == -1)
                  throw PopEmptyStackException("EXCEPTION: Your stack is empty!");
              top--;
              return array[top+1];
           }
           catch (PopEmptyStackException& me)
           {
              std::cerr << me.what();
           }
           return -1;
        }
};

int main()
{
    Stack myStk; //Capacity of 3
    cout << "Popping right away.";
    myStk.pop();
    cout << " Pushing 1st item.";
    myStk.push(1);
    cout << " Pushing 2nd item.";
    myStk.push(2);
    cout << " Pushing 3rd item.";
    myStk.push(3);
    cout << " Pushing 4st item.";
    myStk.push(4);

}

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