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  1. #include<stdio.h>
  2. #include<malloc.h>
  3.  
  4. struct binaryTreeNode{
  5. 	int data;
  6. 	struct binaryTreeNode * left;
  7. 	struct binaryTreeNode * right;
  8. };
  9.  
  10. struct node
  11. {
  12. 	struct binaryTreeNode * data;
  13. 	struct node * next;
  14. };
  15.  
  16. struct queue
  17. {
  18. 	struct node * front;
  19. 	struct node * rear;
  20. };
  21.  
  22. struct queue * enQueue(struct queue * q, struct binaryTreeNode * num)
  23. {
  24. 	struct node * temp = (struct node*)malloc(sizeof(struct node));
  25. 	temp -> data = num;
  26. 	temp -> next = NULL;
  27. 	if(q == NULL)
  28. 	{
  29. 		q = (struct queue*)malloc(sizeof(struct queue));		
  30. 		q -> front = temp;
  31. 	}
  32. 	else
  33. 		q -> rear -> next = temp;
  34. 	q -> rear = temp;
  35. 	//Code obtained from http://w...content-available-to-author-only...s.com
  36. 	//Feel free to copy but please acknowledge the site wherever possible
  37. 	return q;
  38. }
  39.  
  40. struct queue * deQueue(struct queue * q)
  41. {
  42. 	struct node * temp = q->front;
  43. 	q -> front = q->front->next;
  44. 	free(temp);
  45. 	if(q->front == NULL)
  46. 		return NULL;
  47. 	else
  48. 		return q;
  49. }
  50.  
  51. int isQueueEmpty(struct queue * q)
  52. {
  53. 	if(q)
  54. 		return 0;
  55. 	else
  56. 		return 1;
  57. }
  58.  
  59. int sumOfBinaryTree(struct binaryTreeNode * root)
  60. {
  61. 	// Terminating condition
  62. 	if(root == NULL)
  63. 	{
  64. 		return 0;
  65. 	}
  66. 	else
  67. 	{
  68. 		//Recursively call the addition of root + left + right
  69. 		return (root -> data + sumOfBinaryTree(root -> left) + sumOfBinaryTree(root -> right));
  70. 	}
  71. }
  72.  
  73. int sumOfBinaryTreeIterative(struct binaryTreeNode * root)
  74. {
  75. 	// Level order traversal
  76. 	struct binaryTreeNode * temp = NULL;
  77. 	struct queue * Q = NULL;
  78.  
  79. 	// Maintain a count
  80. 	int sum = 0;
  81.  
  82. 	if(root == NULL)
  83. 		return 0;
  84.  
  85. 	Q = enQueue(Q, root);
  86. 	while(!isQueueEmpty(Q))
  87. 	{
  88. 		temp = Q -> front -> data;
  89.  
  90. 		// Add it to the sum
  91. 		sum += temp -> data;
  92.  
  93. 		Q = deQueue(Q);
  94. 		if(temp -> left)
  95. 			Q = enQueue(Q, temp -> left);
  96. 		if(temp -> right)
  97. 			Q = enQueue(Q, temp -> right);
  98. 	}
  99. 	// Delete the queue
  100. 	free(Q);
  101.  
  102. 	// Now return the count
  103. 	return sum;
  104. }
  105.  
  106. // Test the above functions
  107. int main(void)
  108. {
  109. 	// Initialize the tree
  110. 	struct binaryTreeNode * root = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  111. 	root-> data = 1;
  112. 	struct binaryTreeNode * l = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  113. 	l -> data = 2;
  114. 	struct binaryTreeNode * ll = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  115. 	ll -> data = 4;
  116. 	ll -> left = ll -> right = NULL;
  117. 	struct binaryTreeNode * lr = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  118. 	lr -> data = 5;
  119. 	lr -> left = lr -> right = NULL;
  120. 	l -> left = ll;
  121. 	l -> right = lr;
  122. 	struct binaryTreeNode * r = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  123. 	r -> data = 3;
  124. 	struct binaryTreeNode * rl = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  125. 	rl -> data = 6;
  126. 	rl -> left = rl -> right = NULL;
  127. 	struct binaryTreeNode * rr = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  128. 	rr -> data = 7;
  129. 	rr -> left = rr -> right = NULL;
  130. 	r -> left = rl;
  131. 	r -> right = rr;
  132. 	root -> left = l;
  133. 	root -> right = r;
  134.  
  135. 	printf("Sum of nodes = %d",sumOfBinaryTreeIterative(root));
  136.  
  137. 	return 0;
  138. }
Success #stdin #stdout 0s 2380KB
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stdin
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Standard input is empty
stdout
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Sum of nodes = 28
https://ideone.com/IfbxoG
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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