Code:
#include stdio.h
int array[100], n;
main()
{
int choice, num;
n = 0;/*Represents number of nodes in the heap*/
while(1)
{
printf("1.Insert the element \n");
printf("2.Delete the element \n");
printf("3.Display all elements \n");
printf("4.Quit \n");
printf("Enter your choice : ");
scanf("%d", &choice);
switch(choice)
{
case 1:
printf("Enter the element to be inserted to the list : ");
scanf("%d", &num);
insert(num, n);
n = n + 1;
break;
case 2:
printf("Enter the elements to be deleted from the list: ");
scanf("%d", &num);
delete(num);
break;
case 3:
display();
break;
case 4:
exit(0);
default:
printf("Invalid choice \n");
}/*End of switch */
}/*End of while */
}/*End of main()*/
display()
{
int i;
if (n == 0)
{
printf("Heap is empty \n");
return;
}
for (i = 0; i < n; i++)
printf("%d ", array[i]);
printf("\n");
}/*End of display()*/
insert(int num, int location)
{
int parentnode;
while (location > 0)
{
parentnode =(location - 1)/2;
if (num <= array[parentnode])
{
array[location] = num;
return;
}
array[location] = array[parentnode];
location = parentnode;
}/*End of while*/
array[0] = num; /*assign number to the root node */
}/*End of insert()*/
delete(int num)
{
int left, right, i, temp, parentnode;
for (i = 0; i < num; i++) {
if (num == array[i])
break;
}
if (num != array[i])
{
printf("%d not found in heap list\n", num);
return;
}
array[i] = array[n - 1];
n = n - 1;
parentnode =(i - 1) / 2; /*find parentnode of node i */
if (array[i] > array[parentnode])
{
insert(array[i], i);
return;
}
left = 2 * i + 1; /*left child of i*/
right = 2 * i + 2; /* right child of i*/
while (right < n)
{
if (array[i] >= array[left] && array[i] >= array[right])
return;
if (array[right] <= array[left])
{
temp = array[i];
array[i] = array[left];
array[left] = temp;
i = left;
}
else
{
temp = array[i];
array[i] = array[right];
array[right] = temp;
i = right;
}
left = 2 * i + 1;
right = 2 * i + 2;
}/*End of while*/
if (left == n - 1 && array[i]) {
temp = array[i];
array[i] = array[left];
array[left] = temp;
}
}
Output:
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 1
Enter the element to be inserted to the list : 30
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 1
Enter the element to be inserted to the list : 50
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 1
Enter the element to be inserted to the list : 70
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 2
Enter the elements to be deleted from the list: 10
10 not found in heap list
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 2
Enter the elements to be deleted from the list: 50
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 1
Enter the element to be inserted to the list : 100
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 3
100 30 70
1.Insert the element
2.Delete the element
3.Display all elements
4.Quit
Enter your choice : 4
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