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B_Tree_Swap.c
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B_Tree_Swap.c
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#include <stdio.h>
#include <stdlib.h>
struct Node
{
int iData;
struct Node *psLeft;
struct Node *psRight;
};
typedef struct Node Node;
void GetNewNode(Node **psNewNode, int iData)
{
*psNewNode = (Node *) malloc(sizeof(Node));
(*psNewNode)->psLeft = NULL;
(*psNewNode)->psRight = NULL;
(*psNewNode)->iData = iData;
}
void AddLeftNode(Node *psRoot, int iData)
{
Node *psNewNode = NULL;
GetNewNode(&psNewNode, iData);
psRoot->psLeft = psNewNode;
}
void AddRightNode(Node *psRoot, int iData)
{
Node *psNewNode = NULL;
GetNewNode(&psNewNode, iData);
psRoot->psRight = psNewNode;
}
void PrintLeftBoundry(Node *psRoot)
{
if (psRoot->psLeft)
{
printf("%d ",psRoot->iData);
PrintLeftBoundry(psRoot->psLeft);
}
else if (psRoot->psRight)
{
printf("%d ",psRoot->iData);
PrintLeftBoundry(psRoot->psRight);
}
}
void PrintRightBoundry(Node *psRoot)
{
if (psRoot->psRight)
{
printf("%d ",psRoot->iData);
PrintLeftBoundry(psRoot->psRight);
}
else if (psRoot->psLeft)
{
printf("%d ",psRoot->iData);
PrintLeftBoundry(psRoot->psLeft);
}
}
void PrintLeaves(Node *psRoot)
{
if (psRoot)
{
PrintLeaves(psRoot->psLeft);
if ((psRoot->psLeft == NULL) && (psRoot->psRight == NULL))
{
printf("%d ", psRoot->iData);
}
PrintLeaves(psRoot->psRight);
}
}
void PrintBoundry(Node *psRoot)
{
if (psRoot)
{
printf("%d ", psRoot->iData);
// Print Left Boundry
PrintLeftBoundry(psRoot->psLeft);
// Print Leaf nodes
PrintLeaves(psRoot->psLeft);
PrintLeaves(psRoot->psRight);
// Print Right Boundry
PrintRightBoundry(psRoot->psRight);
}
}
Node* FindParent(Node *psRoot, int iData)
{
Node *psPrev = psRoot;
if (psRoot->psLeft)
{
return NULL;
}
if (psRoot->psLeft)
{
if (psRoot->psLeft->iData == iData)
{
return psRoot;
}
}
else
{
return FindParent(psRoot->psLeft, iData);
}
if (psRoot->psRight)
{
if (psRoot->psRight->iData == iData)
{
return psRoot;
}
}
else
{
return FindParent(psRoot->psRight, iData);
}
}
void SwapNodes(Node *psRoot, int iData1, int iData2)
{
Node *psParent1 = NULL;
Node *psParent2 = NULL;
Node *psTemp = NULL;
psParent1 = FindParent(psRoot, iData1);
psParent2 = FindParent(psRoot, iData2);
if (psParent1->psLeft->iData == iData1)
{
if (psParent2->psLeft->iData == iData2)
{
psTemp = psParent1->psLeft;
psParent1->psLeft = psParent2->psLeft;
psParent2->psLeft = psTemp;
}
else if (psParent2->psRight->iData == iData2)
{
psTemp = psParent1->psLeft;
psParent1->psLeft = psParent2->psRight;
psParent2->psRight = psTemp;
}
}
else if (psParent1->psRight->iData == iData1)
{
if (psParent2->psLeft->iData == iData2)
{
psTemp = psParent1->psRight;
psParent1->psRight = psParent2->psLeft;
psParent2->psLeft = psTemp;
}
else if (psParent2->psRight->iData == iData2)
{
psTemp = psParent1->psRight;
psParent1->psRight = psParent2->psRight;
psParent2->psRight = psTemp;
}
}
}
int main()
{
int iRetVal = 0;
Node *psRoot = NULL;
GetNewNode(&psRoot, 10);
AddLeftNode(psRoot,5);
AddRightNode(psRoot,15);
AddLeftNode(psRoot->psLeft,3);
AddRightNode(psRoot->psLeft->psLeft,4);
AddLeftNode(psRoot->psRight,13);
AddRightNode(psRoot->psRight->psLeft,14);
AddRightNode(psRoot->psRight,20);
AddRightNode(psRoot->psRight->psRight,25);
AddLeftNode(psRoot->psRight->psRight->psRight,22);
PrintBoundry(psRoot);
printf("\n");
SwapNodes(psRoot, 15, 13);
PrintBoundry(psRoot);
return iRetVal;
}