Implement a simple Heap C Programming.
#include <stdio.h> int array[100], n; void 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;
}
}
