C Program to Find the Sum of all Nodes in a Tree

This C Program Finds the Sum of all Nodes in a Tree such that any node is sum of values at left and right sub tree.

Here is source code of the C Program to Find the Sum of all Nodes in a Tree such that any node is sum of values at left and right sub tree. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Find the Sum of all Nodes in a Tree

```
 *
```
```
 *        50
```
```
 *        / \
```
```
 *     20  30
```
```
 *    / \
```
```
 *   70  80
```
```
 *   / \   \
```
```
 *  10 40   60
```
```
 *
```
```
 */
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
```
```
 
```
```
struct btnode
```
```
{
```
```
    int value;
```
```
    struct btnode *l;
```
```
    struct btnode *r;
```
```
}*root = NULL, *ptr, *temp;
```
```
 
```
```
// Function Prototypes
```
```
int find_depth(struct btnode *);
```
```
int modify_tree(struct btnode *);
```
```
void printout(struct btnode *);
```
```
struct btnode* newnode(int);
```
```
 
```
```
void main()
```
```
{
```
```
    int d;
```
```
 
```
```
    root  =  newnode(50);
```
```
    root->l  =  newnode(20);
```
```
    root->r  =  newnode(30);
```
```
    root->l->l  =  newnode(70);
```
```
    root->l->r  =  newnode(80);
```
```
    root->l->r->r  =  newnode(60);
```
```
    root->l->l->l  =  newnode(10);
```
```
    root->l->l->r  =  newnode(40);
```
```
    printout(root);
```
```
    ptr = root;
```
```
    d = find_depth(ptr);
```
```
    printf("Depth of tree is %d\n",d);
```

    printf("tree elements after modification are ----\n");

```
    modify_tree(ptr);
```
```
    printout(ptr);
```
```
}
```
```
 
```
```
// Create a node
```
```
struct btnode* newnode(int value)
```
```
{
```

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

```
    node->value  =  value;
```
```
    node->l  =  NULL;
```
```
    node->r  =  NULL;
```
```
    return(node);
```
```
}
```
```
 
```
```
// Function to find depth of a tree
```
```
int find_depth(struct btnode* tree)
```
```
{
```
```
    int ldepth, rdepth;
```
```
 
```
```
    if (tree == NULL)
```
```
        return 0;
```
```
    else
```
```
    {
```
```
        ldepth = find_depth(tree->l);
```
```
        rdepth = find_depth(tree->r);
```
```
        if (ldepth > rdepth)
```
```
            return ldepth + 1;
```
```
        else
```
```
            return rdepth + 1;
```
```
    }
```
```
}
```
```
 
```
```
// Function to modify the tree
```
```
int modify_tree(struct btnode *tree)
```
```
{
```
```
    int i, original;
```
```
 
```
```
    if (tree == NULL)
```
```
        return 0;
```
```
    original = tree->value;
```

    tree->value = modify_tree(tree->l) + modify_tree(tree->r);

```
    return tree->value + original;
```
```
}
```
```
 
```

// Function to print the elements of tree

```
void printout(struct btnode *tree)
```
```
{
```
```
    if (tree->l)
```
```
        printout(tree->l);
```
```
    printf("%d\n", tree->value);
```
```
    if (tree->r)
```
```
        printout(tree->r);
```
```
}
```

$ gcc tree37.c
$ a.out
10
70
40
20
80
60
50
30
Depth of tree is 4
tree elements after modification are ----
0
50
0
260
60
0
310
0

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