I want to do a binary tree code that outputs an actual tree, but I'm a little lost right now and don't know what to do. I did this code in Dev C++

Here's the code so far:

``````#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<strings.h>

#define TRUE 1
#define FALSE 0

int size;

typedef struct tree_node
{
struct tree_node*left,*right,*parent;
int key;
}
Tree;

#define set_parent_left(t)
{
if ((t)->left!=NULL)(t)->left->parent=(t);
}
#define set_parent_right(t)
{
if ((t)->right!=NULL)(t)->right->parent=(t);
}

Tree*splay(int i, Tree*t)
{
Tree N,*l,*r,*y;
if(t==NULL)return t;
N.left=N.right=NULL;
l=r=&N;

for(;;)
{
if(i<t->key)
{
if(t->left==NULL)break;
if(i<t->left->key)
{
y=t->left;          /*rotate right*/
t->left=y->right;
if(t->left!=NULL)t->left->parent=t;
y->right=t;
t->parent=y;
t=y;
if(t->left==NULL)break;
}
t->parent=r;
r=t;
t=t->left;
}
else if(i>t->key)
{
if(t->right==NULL)break;
if(i>t->right->key)
{
y=t->right;        /*rotate left*/
t->right=y->left;
if(t->right!=NULL)t->right->parent=t;
y->left=t;
t->parent=y;
t=y;
if(t->right==NULL)break;
}
t->parent=l;
l=t;
t=t->right;
}
else
{
break;
}
}
l->right=t->left;          /*assemble*/
if(l->right!=NULL)l->right->parent=l;
r->left=t->right;
if(r->left!=NULL)r->left->parent=r;
t->left=N.right;
if(t->left!=NULL)t->left->parent=t;
t->right=N.left;
if(t->right!=NULL)t->right->parent=t;
t->parent=NULL;
return t;
}

Tree*move_to_root(int i,Tree*t)
{
Tree N,*l,*r,*y;
if(t==NULL)return t;
N.left=N.right=NULL;
l=r=&N;

for(;;)
{
if(i<t->key)
{
if(t->left==NULL)break;
t->parent=r;
r=t;
t=t->left;
}
else if(i>t->key)
{
if(t->right==NULL)break;
t->parent=l;
l=t;
t=t->right;
}
else
{
break;
}
}
l->right=t->left;             /*assemble*/
if(l->right!=NULL)l->right->parent=l;
r->left=t->right;
if(r->left!=NULL)r->left->parent=t;
t->left=N.right;
if(t->left != NULL) t->left->parent=t;
t->right=N.left;
if(t-right!=NULL)t->right->parent=t;
t->parent=NULL;
return t;
}

int check_tree(Tree*t)
{
if(t==NULL)return TRUE;
if(t->left!=NULL&&(t->left->parent!=t||!check_tree(t->left)))
{
return FALSE;
}
if(t->right!=NULL&&(t->right->parent!=t||!check_tree(t->right)))
{
return FALSE;
}
return TRUE;
}

/*Free all the nodes of the given tree*/
void free_ptree(Pnode*pn)
{
if(pn==NULL)return;
free_ptree(pn->left);
free_ptree(pn->right);
my_free(pn);
}

Pnode * build_ptree_rec(Tree * t)
{
Pnode * pn;
if(t == NULL) return NULL;
pn = my_alloc(sizeof(Pnode));
pn->left = build_ptree_rec(t->left);
pn->right = build_ptree_rec(t->right);
if(pn->left != NULL) pn->left->parent_dir = -1;
if(pn->right != NULL) pn->right->parent_dir = 1;

sprintf(pn->label, "%d", t->key);
pn->labeln = strlen(pn->label);
return pn;
}

Pnode * build_ptree(Tree *t)
{
Pnode *pn;
if(t==NULL)return NULL;
pn = build_ptree_rec(t);
pn->parent_dir = 0;
return pn;
}

#define MAX_HEIGHT 1000
int lprofile[MAX_HEIGHT];
int rprofile[MAX_HEIGHT];

void compute_lprofile(Pnode *pn, int x, int y)
{
int i, isleft;
if(pn == NULL) return;
isleft = (pn->parent_dir == -1);
lprofile[y] = min(lprofile[y], x-((pn->lablen-isleft)/2));
if(pn->left != NULL){
for(i=1; i<= pn->edge_length && y+i < MAX_HEIGHT; i++)
{
lprofile[y+i] = min(lporfile[y+i], x-i);
}
}

compute_lprofile(pn->left, x-pn->edge_length-1, y+pn->edge_length+1);
compute_lprofile(pn->right, x+pn->edge_length+1, y+pn->edge_length+1);

}

}

void compute_edge_lengths(Pnode *pn){
int h, hmin, i, delta;
if(pn==NULL) return;
compute_edge_lengths(pn->left);
compute_edge_lengths(pn->right);

/* first fill in the edge_length of pn */

if (pn->right++NULL && pn->left == NULL){
pn->edge_length = 0;
} else {
if(pn->left != NULL){
for(i=0; i<pn->left->height && i < MAX_HEIGHT; i++)
{
rprofile[i] = -INFINITY;
}
compute_rprofile(pn->left, 0, 0);
hmin = pn -> left -> height;
} else {
hmin = 0;

}
if(pn->right != NULL) {
for(i=0;i<pn->right->height && i < MAX_HEIGHT; i++){
lprofile[i]=INFINITY;
}
compute_lprofile(pn->right, 0, 0);
hmin=min(pn->right->height, hmin);
} else {
hmin = 0;
}
delta = 4;
for (i=0; i<hmin; i++){
delta = max(delta, 2 + 1 + rprofile[i] - lprofile[i]);
/* the "2" guarantees a gap between different parts of the tree */

}

/* If the node has two children of height 1, then we allow the two leaves to be within 1, instead of 2 */

if (((pn->left != NULL && pn->left->height ==1) || (pn->left != NULL && pn->right->height == 1)) && delta >4)delta--;

pn->edge_length=((delta+1)/2)-1;

}

/* now fill in the height of pn */

h =1;
if(pn->left!=NULL){
h = max(pn->left->height + pn->edge_length + 1, h);
}
if(pn->right!=NULL){
h = max(pn->right->height + pn->edge_length +1, h);

}

pn->height = h;

}

int print_next; /*used by print_level. If you call "printf()" at */
/* ant point, this is the x coordinate of the next */
/* char printed. */

/*
* This function prints the given level of the given tree, assuming
* that the node pn has the given x coordinate.
*/

void print_level(Pnode *pn, int x, int level) {
int i, isleft;
if(pn == NULL) return;
isleft = (pn->parent_dir == -1);
if(level == 0) {
for(i=0;i<(x-print_next-((pn->lablen-isleft)/2)); i++) {
printf(" ");
}
print_next +=i;
printf("%s", pn->label);
print_next += pn->lablen;
} else if(pn->edge_length >= lelvel) {
if(pn->left != NULL) {
for(i=0; i<(x-print_next-(level)); i++) {
printf(" ");
}
print_next += i;
printf("/");
print_next++;
}

if (pn->right != NULL) {
for(i=0; i<(x-print_next+(level)); i++) {
printf(" ");
}
print_next += i;
printf("\\");
print_next++;
}
}else{
print_level(pn->left, x-pn->edge_length-1, level-pn->edge_length-1);
print_level(pn->right, x+pn->edge_length+1, level-pn->edge_length-1);
}
}

/* This preety-prints the given tree, left-justified.
* The tree is drawn in such a way that both of the edges down from
* a node are the same length. This length is the minimum such that
* the two subtrees are separated by at least two blanks.
*/

void pretty_print_tree(Tree *t) {
Pnode *proot;
int xmin, i;
if(t == NULL) return;
proot = build_ptree(t);
compute_edge_lengths(proot);
for(i=0; i<proot->height && i < MAX_HEIGHT; i++) {
lprofile[i] = INFINITY;
}
compute_lprofile(proot, 0, 0);
xmin = 0;
for (i = 0; i < proot->height && i < MAX_HEIGHT; i++) {
xmin = min(xmin, lprofile[i]);
}

for(i = 0; i<proot->height; i++) {
print_next = 0;
print_level(proot, -min, i);
print("\n");
}

if (proot->height >= MAX_HEIGHT) {
printf("(This tree is taller than %d, and may be drawn incorrectly.)\n", MAX_HEIGHT);
}
free_ptree(proot);
}

Tree * insert(int i, Tree *t) {

/* Insert i into the tree t, unless it's already there. */
/* Return a pointer to the resulting tree. */
Tree * new;

new = (Tree *) my_alloc(sizeof(Tree));
new->key = i;
if(t == NULL) {
new->left = new->right = new->parent = NULL;
size = 1;
return new;
}

return new;
} else {/* We get here if it's already in the tree */
/* Don't add it again */
my_free(new);
return t;
}
}

Tree * delete(int i, Tree * t) {
/* Deletes i from the tree if it's there. */
/* Return a pointer to the resulting tree. */

Tree * x;
if(t==NULL) return NULL;
t = splay(i, t);
if(i == t->key){ /* found it */
if(t-left == NULL) {
x = t->right;
}else {
x = splay(i, t->left);
x->right = t->right;
set_parent_right(x);
}

size--;
my_free(t);
return x;
}
return t; /* It wasn't there */
}

void main() {
Tree * root;
char line;
int i, N;
root = NULL; /* the empty tree */
size = 0;
while(TRUE) {
printf("Enter the number of nodes in the tree: ");
N = -1;
if (fgets(line, sizeof(line), stdin) == NULL) exit(1);
sscanf(line, "%d", &N);
if((N<1) || {N > 200)) {
printf("Choose a number between 1 and 200.\n");
continue;
}
break;
}

for(i=0;i<N;i++){
root = insert(i, root);
if(!chack_tree(root)) printf("error\n");;
}
pretty_print_tree(root);
for(;;){
printf("Select a node to splay: ");
if (fgets(line, sizeof(line), stdin == NULL) break;
if((sscanf(line, "%d", &i) == 1) && (i>=0 && i<N)) {
/* root = move_to_root(i, root); */
root = splay(i, root);``````

As much as I love trees, I'm not keen on deciphering your code and then figuring out where you're lost. So I'll ask you to be more specific about what you want help with, and show you the structure code I use myself:

``````void jsw_structure_r ( struct jsw_node *root, int level )
{
int i;

if ( root == NULL ) {
for ( i = 0; i < level; i++ )
putchar ( '\t' );
puts ( "~" );
}
else {
jsw_structure_r ( root->link, level + 1 );
for ( i = 0; i < level; i++ )
putchar ( '\t' );
printf ( "%d\n", root->data );
jsw_structure_r ( root->link, level + 1 );
}
}

void jsw_structure ( struct jsw_tree *tree )
{
jsw_structure_r ( tree->root, 0 );
}``````
Be a part of the DaniWeb community

We're a friendly, industry-focused community of 1.18 million developers, IT pros, digital marketers, and technology enthusiasts learning and sharing knowledge.