﻿ C# - Sort the elements of a stack in descending order

# C# Sharp Stack Exercises: Sort the elements of a stack in descending order

## C# Sharp Stack: Exercise-2 with Solution

Write a C# program to sort the elements of a given stack in descending order.

Sample Solution:

C# Code:

``````using System;
public class Stack
{
private int[] items;
private int top;

public Stack(int size)
{
items = new int[size];
top = -1;
}

public bool IsEmpty()
{
return top == -1;
}

public bool IsFull()
{
return top == items.Length - 1;
}

public void Push(int item)
{
if (IsFull())
{
Console.WriteLine("Stack Full!");
return;
}

items[++top] = item;
}

public int Pop()
{
if (IsEmpty())
{
Console.WriteLine("Stack underflow");
return -1;
}

return items[top--];
}

public int Peek()
{
if (IsEmpty())
{
Console.WriteLine("Stack is empty");
return -1;
}

return items[top];
}

public static int Size(Stack stack)
{
return stack.top + 1;
}

public static void SortDescending(Stack stack)
{
if (stack.IsEmpty())
{
Console.WriteLine("Stack is empty");
return;
}

Stack tempStack = new Stack(stack.items.Length);

while (!stack.IsEmpty())
{
int currentItem = stack.Pop();

while (!tempStack.IsEmpty() && currentItem > tempStack.Peek())
{
stack.Push(tempStack.Pop());
}

tempStack.Push(currentItem);
}

while (!tempStack.IsEmpty())
{
stack.Push(tempStack.Pop());
}
}

public static void Display(Stack stack)
{
if (stack.IsEmpty())
{
Console.WriteLine("Stack is empty");
return;
}

Console.WriteLine("Stack elements:");
for (int i = stack.top; i >= 0; i--)
{
Console.Write(stack.items[i]+" ");
}
}

}

public class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Initialize a stack:");
Stack stack = new Stack(10);
Console.WriteLine("\nInput some elements onto the stack:");
stack.Push(1);
stack.Push(3);
stack.Push(3);
stack.Push(9);
stack.Push(5);
Stack.Display(stack);
Stack.SortDescending(stack);
Console.WriteLine("\nStack elements in descending order:");
Stack.Display(stack);
Console.WriteLine("\nInput two more elements onto the stack:");
stack.Push(0);
stack.Push(10);
Stack.Display(stack);
Console.WriteLine("\nStack elements in descending order:");
Stack.SortDescending(stack);
Stack.Display(stack);
}
}
``````

Sample Output:

```Initialize a stack:

Input some elements onto the stack:
Stack elements:
5 9 3 3 1
Stack elements in descending order:
Stack elements:
9 5 3 3 1
Input two more elements onto the stack:
Stack elements:
10 0 9 5 3 3 1
Stack elements in descending order:
Stack elements:
10 9 5 3 3 1 0
```

Flowchart:

C# Sharp Code Editor:

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