C Program to Print All Paths from Root to Leaf in a Tree

This C Program Prints all the Paths from the Root to the Leaf in a Tree.

Here is source code of the C program to Print only Nodes in Left SubTree. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Print all the Paths from the Root to the Leaf

```
 * in a Tree 
```
```
 */
```
```
#include<stdio.h>
```
```
#include<stdlib.h>
```
```
 
```
```
struct node
```
```
{
```
```
   int data;
```
```
   struct node* left;
```
```
   struct node* right;
```
```
};
```
```
 
```

void print_paths_recur(struct node* node, int path[], int path_len);

```
void print_array(int ints[], int len);
```
```
 
```

/*Function to store all the paths from the root node to all leaf nodes in  a array*/

```
 
```
```
void print_paths(struct node* node) 
```
```
{
```
```
  int path[1000];
```
```
  print_paths_recur(node, path, 0);
```
```
}
```
```
 
```

/*Function which helps the print_path to recursively print all the nodes*/

void print_paths_recur(struct node* node, int path[], int path_len)

```
{
```
```
  if (node == NULL) 
```
```
    return; 
```
```
 
```
```
  path[path_len] = node->data;
```
```
  path_len++;
```
```
 
```

  if (node->left == NULL && node->right == NULL)

```
  {
```
```
    print_array(path, path_len);
```
```
  }
```
```
  else
```
```
  {
```

    print_paths_recur(node->left, path, path_len);    //recursively calls the left node of the tree

    print_paths_recur(node->right, path, path_len);    //recursively calls the right node of the tree

```
  }
```
```
}
```
```
 
```
```
/*Function to print all the paths */
```
```
void print_array(int ints[], int len) 
```
```
{
```
```
  int i;
```
```
  for (i = 0; i < len; i++) 
```
```
  {
```
```
    printf("%d -> ", ints[i]);
```
```
  }
```
```
  printf("\n");
```
```
}    
```
```
 
```
```
struct node* newnode(int data)
```
```
{
```

  struct node* node = (struct node*) malloc(sizeof(struct node));

```
  node->data = data;
```
```
  node->left = NULL;
```
```
  node->right = NULL;
```
```
 
```
```
  return(node);
```
```
}
```
```
 
```
```
int main()
```
```
{ 
```
```
   /*
```
```
    The input tree is as shown below
```
```
                40
```
```
                / \
```
```
            20        60
```
```
            / \       \
```
```
        10        30      80
```
```
                          \
```
```
                            90
```
```
  */ 
```
```
  struct node *root = newnode(40);
```
```
  root->left = newnode(20);
```
```
  root->right = newnode(60);
```
```
  root->left->left = newnode(10);
```
```
  root->left->right = newnode(30);
```
```
  root->right->right = newnode(80);
```

  root->right->right->right = newnode(90);

```
  print_paths(root);
```
```
  return 0;
```
```
}
```

$ cc tree20.c
$ a.out
40 -> 20 -> 10 ->
40 -> 20 -> 30 ->
40 -> 60 -> 80 -> 90 ->

Sanfoundry Global Education & Learning Series – 1000 C Programs.

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