In computer science, a binary tree is a tree data structure in which each node has at most two children, which are referred to as the left child and the right child.
Binary Tree Construction Process
Constract a Binary Tree for the following numbers  60 , 28 , 82 , 46 , 58 , 75 , 12 , 15 , 95 , 87 , 99 , 8
Figure 1 : First, we create the tree having the root as the only node with nodevalue 60
Figure 2 : Since 28 < 60, therefore 28 is attached as left child of the root.
Figure 3 : Next value 82 is greater than 60, so 82 is attached as right child of the root.
Figure 4 : Next value 46 is less than 60 but greater than 28, therefore 46 is attached as right child of 28.
Figure 5 : Next value 58 is less than 60 but greater than from both 28 and 46, therefore 58 is attached as right child of 46.
Figure 6 : Next value 75 is greater than 60 but less than 82, therefore 75 is attached as left child of 82.
Figure 7 : Next value 12 is less than 60 but greater than 28, therefore 12 is attached as left child of 28.
Figure 8 : Next value 15 is less than from both 60 and 28 but greater than 12, therefore 15 is attached as right child of 12.
Figure 9 : Next value 95 is greater than from both 60 and 82, therefore 95 is attached as right child of 82.
Figure 10 : Next value 87 is greater than from both 60 and 82 but less than 95, therefore 87 is attached as left child of 95.
Figure 11 : Next value 99 is greater than from 60, 82 and 95, therefore 99 is attached as right child of 95.
Figure 12 : Next value 8 is less than from 60, 28 and 12, therefore 8 is attached as left child of 12.
//HeaderFile declaration
#include<stdio.h> #include<conio.h> #include<stdlib.h> //Structure declaration struct data { int number; struct data *leftchild; struct data *rightchild; }; //Global variable declaration struct data *root, *node, *child; //Global function declaration void insertNode(int n); void preorder(); void inorder(); void postorder(); void main() { int choice, num; root = NULL; //Infinite loop while(1) { clrscr(); printf("\n Press 1 for insert operation"); printf("\n Press 2 for preorder Presentation"); printf("\n Press 3 for inorder Presentation"); printf("\n Press 4 for postorder Presentation"); printf("\n Press 5 for exit window"); printf("\n Enter your choice..."); scanf("%d",&choice); switch(choice) { case 1: printf("\n Enter the Number..."); scanf("%d",&num); insertNode(num); break; case 2: preorder(); getch(); break; case 3: inorder(); getch(); break; case 4: postorder(); getch(); break; case 5: exit(0); //Exit from infinite loop default: printf("\n\n\n WRONG INPUT"); } } } //Insert operation void insertNode(int n) { if(root == NULL) { root = (struct data *) malloc(sizeof(struct data)); root>number = n; root>leftchild = NULL; root>rightchild = NULL; } else { child = (struct data *) malloc(sizeof(struct data)); child>number = n; child>leftchild = NULL; child>rightchild = NULL; node = root; while(node != NULL) { //If number <= root value then goto the left side if(n <= node>number) { if(node>leftchild == NULL) { node>leftchild = child; break; } else node = node>leftchild; } //If number > root value then goto the right side if(n > node>number) { if(node>rightchild == NULL) { node>rightchild = child; break; } else node = node>rightchild; } } } } //Preorder traversal using recursion void preorder() { node = root; if(node != NULL) { printf("\t%d",node>number); preorder(node>leftchild); preorder(node>rightchild); } } //Inorder traversal using recursion void inorder() { node = root; if(node != NULL) { inorder(node>leftchild); printf("\t%d",node>number); inorder(node>rightchild); } } //Postorder traversal using recursion void postorder() { node = root; if(node != NULL) { postorder(node>leftchild); postorder(node>rightchild); printf("\t%d",node>number); } } 
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