C# Program to Demonstrate Heap Sort

This C# Program Demonstrates Heap Sort. Here it first removes the topmost item (the largest) and replace it with the rightmost leaf. The topmost item is stored in an array and Re-establish the heap.this is done until there are no more items left in the heap.

Here is source code of the C# Program to Demonstrate Heap Sort. The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

```
/*
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```
 * C# Program to Demonstrate Heap Sort
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```
 */
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```
using System;
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class heap
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{
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    int[] r = { 2,5,1,10,6,9,3,7,4,8};
```
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    public void hsort()
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    {
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        int i, t;
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        for (i = 5; i >= 0; i--)
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        {
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            adjust(i, 9);
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        }
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        for (i = 8; i >= 0; i--)
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        {
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            t = r[i + 1];
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            r[i + 1] = r[0];
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            r[0] = t;
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            adjust(0, i);
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        }
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    }
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    private void adjust(int i, int n)
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    {
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        int t, j;
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        try
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        {
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            t = r[i];
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            j = 2 * i;
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            while (j <= n)
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            {
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                if (j < n && r[j] < r[j + 1])

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                    j++;
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                if (t >=r[j])
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                    break;
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                r[j / 2] = r[j];
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                j *= 2;
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            }
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            r[j / 2] = t;
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        }
```

        catch (IndexOutOfRangeException e)

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        {
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            Console.WriteLine("Array Out of Bounds ", e);

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        }
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    }
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    public void print()
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    {
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        for (int i = 0; i < 10; i++)
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        {
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            Console.WriteLine("{0}", r[i]);

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        }
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    }
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    public static void Main()
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    {
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        heap obj = new heap();
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        Console.WriteLine("Elements Before sorting : ");

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        obj.print();
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        obj.hsort();
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        Console.WriteLine("Elements After sorting : ");

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        obj.print();
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        Console.Read();
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    }
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}
```

Here is the output of the C# Program:

Elements Before Sorting :
2
5
1
10
6
9
3
7
4
8
Elements After Sorting :
1
2
3
4
5
6
7
8
9
10

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