Inorder Preorder Postorder traversal
Write a C Program for Inorder Preorder Postorder traversal of Binary Tree without Recursion. Here’s simple Program for Inorder Preorder Postorder traversal of Binary Tree ( Non Recursive ) in C Programming Language.
What is Tree ?
In linear data structure, data is organized in sequential order and in non-linear data structure, data is organized in random order. Tree is a very popular data structure used in wide range of applications.
A tree data structure can be defined as follows…
- Tree is a non-linear data structure which organizes data in hierarchical structure and this is a recursive definition.
A tree data structure can also be defined as follows…
- Tree data structure is a collection of data (Node) which is organized in hierarchical structure and this is a recursive definition.
Every individual element is called as Node. Node in a tree data structure, stores the actual data of that particular element and link to next element in hierarchical structure.
Below is the source code for C Program for Inorder Preorder Postorder traversal of Binary Tree without Recursion which is successfully compiled and run on Windows System to produce desired output as shown below :
SOURCE CODE : :
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/* C Program for Inorder Preorder Postorder traversal of Binary Tree */ #include<stdio.h> #include<stdlib.h> #define MAX 50 struct node { struct node *lchild; int info; struct node *rchild; }; struct node *insert_nrec(struct node *root, int ikey ); void nrec_pre(struct node *root); void nrec_in(struct node *root); void nrec_post(struct node *root); void display(struct node *ptr,int level); struct node *queue[MAX]; int front=-1,rear=-1; void insert_queue(struct node *item); struct node *del_queue(); int queue_empty(); struct node *stack[MAX]; int top=-1; void push_stack(struct node *item); struct node *pop_stack(); int stack_empty(); int main( ) { struct node *root=NULL, *ptr; int choice,k; while(1) { printf("\n"); printf("1.Insert\n"); printf("2.Display\n"); printf("3.Preorder Traversal\n"); printf("4.Inorder Traversal\n"); printf("5.Postorder Traversal\n"); printf("6.Quit\n"); printf("\nEnter your choice : "); scanf("%d",&choice); switch(choice) { case 1: printf("\nEnter the key to be inserted : "); scanf("%d",&k); root = insert_nrec(root, k); break; case 2: printf("\n"); display(root,0); printf("\n"); break; case 3: nrec_pre(root); break; case 4: nrec_in(root); break; case 5: nrec_post(root); break; case 6: exit(1); default: printf("\nWrong choice\n"); }/*End of switch*/ }/*End of while */ return 0; }/*End of main( )*/ struct node *insert_nrec(struct node *root, int ikey) { struct node *tmp,*par,*ptr; ptr = root; par = NULL; while( ptr!=NULL) { par = ptr; if(ikey < ptr->info) ptr = ptr->lchild; else if( ikey > ptr->info ) ptr = ptr->rchild; else { printf("\nDuplicate key"); return root; } } tmp=(struct node *)malloc(sizeof(struct node)); tmp->info=ikey; tmp->lchild=NULL; tmp->rchild=NULL; if(par==NULL) root=tmp; else if( ikey < par->info ) par->lchild=tmp; else par->rchild=tmp; return root; }/*End of insert_nrec( )*/ void nrec_pre(struct node *root) { struct node *ptr = root; if( ptr==NULL ) { printf("Tree is empty\n"); return; } push_stack(ptr); while( !stack_empty() ) { ptr = pop_stack(); printf("%d ",ptr->info); if(ptr->rchild!=NULL) push_stack(ptr->rchild); if(ptr->lchild!=NULL) push_stack(ptr->lchild); } printf("\n"); }/*End of nrec_pre*/ void nrec_in(struct node *root) { struct node *ptr=root; if( ptr==NULL ) { printf("Tree is empty\n"); return; } while(1) { while(ptr->lchild!=NULL ) { push_stack(ptr); ptr = ptr->lchild; } while( ptr->rchild==NULL ) { printf("%d ",ptr->info); if(stack_empty()) return; ptr = pop_stack(); } printf("%d ",ptr->info); ptr = ptr->rchild; } printf("\n"); }/*End of nrec_in( )*/ void nrec_post(struct node *root) { struct node *ptr = root; struct node *q; if( ptr==NULL ) { printf("Tree is empty\n"); return; } q = root; while(1) { while(ptr->lchild!=NULL) { push_stack(ptr); ptr=ptr->lchild; } while( ptr->rchild==NULL || ptr->rchild==q ) { printf("%d ",ptr->info); q = ptr; if( stack_empty() ) return; ptr = pop_stack(); } push_stack(ptr); ptr = ptr->rchild; } printf("\n"); }/*End of nrec_post( )*/ /*Functions for implementation of queue*/ void insert_queue(struct node *item) { if(rear==MAX-1) { printf("Queue Overflow\n"); return; } if(front==-1) /*If queue is initially empty*/ front=0; rear=rear+1; queue[rear]=item ; }/*End of insert()*/ struct node *del_queue() { struct node *item; if(front==-1 || front==rear+1) { printf("Queue Underflow\n"); return 0; } item=queue[front]; front=front+1; return item; }/*End of del_queue()*/ int queue_empty() { if(front==-1 || front==rear+1) return 1; else return 0; } /*Functions for implementation of stack*/ void push_stack(struct node *item) { if(top==(MAX-1)) { printf("Stack Overflow\n"); return; } top=top+1; stack[top]=item; }/*End of push_stack()*/ struct node *pop_stack() { struct node *item; if(top==-1) { printf("Stack Underflow....\n"); exit(1); } item=stack[top]; top=top-1; return item; }/*End of pop_stack()*/ int stack_empty() { if(top==-1) return 1; else return 0; } /*End of stack_empty*/ void display(struct node *ptr,int level) { int i; if(ptr == NULL )/*Base Case*/ return; else { display(ptr->rchild, level+1); printf("\n"); for (i=0; i<level; i++) printf(" "); printf("%d", ptr->info); display(ptr->lchild, level+1); } }/*End of display()*/ |
OUTPUT : :
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/* C Program for Inorder Preorder Postorder traversal of Binary Tree */ 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 7 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 5 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 6 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 4 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 9 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 8 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 1 Enter the key to be inserted : 11 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 2 11 9 8 7 6 5 4 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 3 7 5 4 6 9 8 11 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 4 4 5 6 7 8 9 11 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 5 4 6 5 8 11 9 7 1.Insert 2.Display 3.Preorder Traversal 4.Inorder Traversal 5.Postorder Traversal 6.Quit Enter your choice : 6 Process returned 1 |
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Thanks for reading the post….
I just needed this code!!! It was easy to understand. Used it as a reference to debug my code. Thank you.