By | 27.11.2016

# Sort an Array using Heap Sort

Write a C Program to Sort an Array using Heap Sort. Here’s simple C Program to Sort an Array using Heap Sort in C Programming Language.

Below is the source code for C Program to Sort an Array using Heap Sort which is successfully compiled and run on Windows System to produce desired output as shown below :

## SOURCE CODE : :

```/*  C Program to Sort an Array using Heap Sort  */

#include <stdio.h>

void main()
{
int heap, no, i, j, c, root, temp;

printf("\n Enter no of elements :");
scanf("%d", &no);
printf("\n Enter the nos : ");
for (i = 0; i < no; i++)
scanf("%d", &heap[i]);
for (i = 1; i < no; i++)
{
c = i;
do
{
root = (c - 1) / 2;
if (heap[root] < heap[c])   /* to create MAX heap array */
{
temp = heap[root];
heap[root] = heap[c];
heap[c] = temp;
}
c = root;
} while (c != 0);
}

printf("Heap array : ");
for (i = 0; i < no; i++)
printf("%d\t ", heap[i]);
for (j = no - 1; j >= 0; j--)
{
temp = heap;
heap = heap[j    /* swap max element with rightmost leaf element */
heap[j] = temp;
root = 0;
do
{
c = 2 * root + 1;    /* left node of root element */
if ((heap[c] < heap[c + 1]) && c < j-1)
c++;
if (heap[root]<heap[c] && c<j)    /* again rearrange to max heap array */
{
temp = heap[root];
heap[root] = heap[c];
heap[c] = temp;
}
root = c;
} while (c < j);
}
printf("\n The sorted array is : ");
for (i = 0; i < no; i++)
printf("\t %d", heap[i]);
printf("\n Complexity : \n Best case = Avg case = Worst case = O(n logn) \n");
}```

### Output :

```/*  C Program to Sort an Array using Heap Sort  */

Enter no of elements :7

Enter the nos : 6
5
3
1
8
7
2
Heap array : 8   6       7       1       5       3       2
The sorted array is :      1     2     3     5     6     7     8
Complexity :
Best case = Avg case = Worst case = O(n logn)```

Above is the source code for C Program to Sort an Array using Heap Sort which is successfully compiled and run on Windows System.The Output of the program is shown above .

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