modify

46b215ee · 宋海霞 · dc2d0a5c · 46b215ee · 46b215ee · 46b215ee
--- a/Stack.c
+++ b/Stack.c
 #include "Stack.h"
 /*
 function:
 	Initialize the stack.
@@ -30,8 +29,10 @@ struct BiThrNode* Push(Stack* pS, struct BiThrNode* Elem)
 	//
 	// Stack full, push failed.
 	//
-	if(MAX_STACK_LENGTH < pS->top)
+	if (MAX_STACK_LENGTH < pS->top)
+	{
 		return 0;
+	}
 	pS->top++;
 	pS->buffer[pS->top] = Elem; // Insert the element at the top of the stack
@@ -56,8 +57,10 @@ struct BiThrNode* Pop(Stack* pS)
 	//
 	// The stack is empty and the pop fails
 	//	
-	if(StackEmpty(pS))
+	if (StackEmpty(pS))
+	{
 		return 0;
+	}
 	Elem = pS->buffer[pS->top];
 	pS->top--;

--- a/Stack.h
+++ b/Stack.h
 #ifndef STACK_H_
 #define STACK_H_
 //
 // Include the C standard library header file here
 //
 //
 // Other header files are included here
 //
 //
 // Define the data structure here
 //
@@ -22,12 +17,13 @@
 // Stack
 struct BiThrNode;
-typedef struct Stack{
+typedef struct Stack
+{
 	struct BiThrNode* buffer[MAX_STACK_LENGTH];	// Stack buffer
-	int top;  						    // Indicates the position at the top of the stack, not the number of elements in the stack
+	// Indicates the position at the top of the stack, not the number of elements in the stack
+	int top;  						    
 }Stack;
 //
 // Declare the function here
 //
@@ -37,12 +33,8 @@ struct BiThrNode* Pop(Stack* pS);
 int StackEmpty(Stack* pS);
 struct BiThrNode* Push(Stack* pS, struct BiThrNode* Elem);
 //
 // Declare global variables here
 //
 #endif /* STACK_H_ */
--- a/ThreadBinaryTree.h
+++ b/ThreadBinaryTree.h
 #ifndef THREADBINARYTREE_H_
 #define THREADBINARYTREE_H_
 //
 // Include the C standard library header file here
 //
 #include <stdio.h>
 //
 // Other header files are included here
 //
 #include "Stack.h"
 //
 // Define the data structure here
 //
@@ -26,7 +22,8 @@
 typedef char ElemType;
 typedef unsigned int PtrTag;
-typedef struct _BiThrNode{
+typedef struct _BiThrNode
+{
 	ElemType data;				// Binary tree node data
 	struct _BiThrNode* lchild;	// Left child pointer
 	struct _BiThrNode* rchild;	// Right child pointer
@@ -48,8 +45,6 @@ void OutputResult(PBiThrTree pHead, PBiThrTree pTree);
 // Declare global variables here
 //
 extern Stack stack;
 #endif /* THREADBINARYTREE_H_ */
--- a/main.c
+++ b/main.c
@@ -95,18 +95,20 @@ PBiThrTree InitTree()
 {
 	BiThrNode* pRootNode;
-	if('\0' == data[nIndex])	// End of preordering sequence string of binary tree
+	if ('\0' == data[nIndex])	// End of preordering sequence string of binary tree
+	{
 		pRootNode = NULL;		
+	}
 	else
 	{
 		//
-		// Create parent node
+		// Create parent node, Empty nodes must be ignored
 		//
-		pRootNode = (' ' == data[nIndex] ? NULL : CreateNode(data[nIndex]));	// Empty nodes must be ignored
+		pRootNode = (' ' == data[nIndex] ? NULL : CreateNode(data[nIndex]));	
 		nIndex++;
 	}
-	if(pRootNode != NULL)
+	if (pRootNode != NULL)
 	{
 		//
 		// Recursion is used to implement the first order traversal algorithm
@@ -123,22 +125,22 @@ void OutputResult(PBiThrTree pHead, PBiThrTree pTree)
 	BiThrNode* pNode2;  
 	BiThrNode* pPreNode2;  
-	if(pHead->lchild == NULL)
+	if (pHead->lchild == NULL)
 	{
 		return 0;
 	}	
 	pNode2 = pHead->lchild;
 	pPreNode2 = NULL;
-	while(1)
+	while (1)
 	{	
-		while(1)
+		while (1)
 		{
-			if(pNode2->ltag == 0 && (pPreNode2 == NULL || pPreNode2 != pNode2->lchild))
+			if (pNode2->ltag == 0 && (pPreNode2 == NULL || pPreNode2 != pNode2->lchild))
 			{
 				pNode2 = pNode2->lchild;					
 			}
-			else if(pNode2->rtag == 0)
+			else if (pNode2->rtag == 0)
 			{
 				printf("%c ", pNode2->data);
 				pNode2 = pNode2->rchild;
@@ -155,13 +157,15 @@ void OutputResult(PBiThrTree pHead, PBiThrTree pTree)
 		pNode2 = pNode2->rchild;
-		if(pNode2 == pTree)
+		if (pNode2 == pTree)
+		{
+			if (pNode2->data != '\0')
 			{
-			if(pNode2->data != '\0')
 				printf("%c ", pNode2->data);
+			}
 			pNode2 = pNode2->rchild;
 		}	
-		if(pNode2 == pHead)
+		if (pNode2 == pHead)
 		{
 			break;
 		}