关于字典树的有关问题，代码基本无错，也能跑起来，但是有一点点小疑问

关于字典树的问题，代码基本无错，也能跑起来，但是有一点点小疑问
题就是：：：：在main函数里开始检索后面的for (int i = 0; i < count; i++)


为什么必须加上int，不然就会输出烫烫烫烫

明明赋值了全局变量，也重新赋值0了啊，后来为什么会莫名其妙的变成26了？？

加上int就完全正确了

请指点指点咯


#include <iostream>
using namespace std;

const int branchNum = 26;
int i;

struct TNode
{
bool isStr;
TNode * next[branchNum];
TNode();
};

TNode::TNode()
{
isStr = false;
for (i = 0; i < branchNum; i++)
{
next[i] = NULL;
}
}

class Trie
{
public:
Trie();
void Insert(char *word);
int Search(char *word, int length);
void DeleteTrie(TNode * root);
void refreshTrie();
private:
TNode * root;
};

Trie::Trie()
{
  root = new TNode;
}


void Trie::Insert(char * word)
{
TNode * location = root;
int pos;
while(*word)
{
if (*word >= 'a' && *word <= 'z')
pos = *word - 'a';
else if (*word >= 'A' && *word <= 'Z')
pos = *word - 'A';
else
return;

if (location->next[pos] == NULL)
{
TNode *tem = new TNode;
location->next[pos] = tem;
}
location = location->next[pos];
word++;
}
location->isStr = true;

}

int Trie::Search(char *word, int length)
{
TNode * location = root;
int len,num; 
len = num = 0;

while(*word)
{
if (location->next[*word - 'a'])
{
location = location->next[*word -'a'];
len++;
if (len = length && location->isStr == true)
{
num++;
len = 0;
location = root;
}
word++;

}
else
{
if (len == 0)
word++;
else
{
word = word -len + 1;
len = 0;
location = root;
}
}
}
return num;
}

void Trie::DeleteTrie(TNode * root)
{
for (i = 0; i < branchNum; i++)
{
if (root->next[i] != NULL)
{
DeleteTrie(root->next[i]);
}
}
delete root;
}

void Trie::refreshTrie()
{
DeleteTrie(root);
root = new TNode;
}

int main(void)
{
Trie t;
char text[20000];
char sort[10][10] = {0};
cout<<"请输入要检索的文章 : ";
cin>>text;
int count;
int num = 0;
cout<<"请输入要检索的次数 : ";
cin>>count;

for (i = 0; i < count; i++)
{
cout<<"请输入要检索的关键字 : "<<endl;
cin>>sort[i];
}

cout<<"开始检索。。。"<<endl;

for (int i = 0; i < count; i++)
{
t.Insert(sort[i]);
int tem = t.Search(text, strlen(sort[i]));

if (tem)
cout<<"此文章含有关键字:"<<sort[i]<<"共出现"<<tem<<"次"<<endl;
else 
cout<<"此文章不含有关键字:"<<sort[i]<<endl;
}
t.refreshTrie();

system("pause");

return 0;
}




问题就是：：：：在main函数里开始检索后面的for (int i = 0; i < count; i++)


为什么必须加上int，不然就会输出烫烫烫烫

明明赋值了全局变量，也重新赋值0了啊，后来为什么会莫名其妙的变成26了？？

加上int就完全正确了

请指点指点咯

------解决方案--------------------
LZ用i这个变量用的太多了,
main函数里面的第二个for在使用:

C/C++ code

t.Insert(sort[i]); 
int tem = t.Search(text, strlen(sort[i]));