应该是while循环招致的.exe已停止工作，求指导是哪里出的错

应该是while循环导致的.exe已停止工作，求指导是哪里出的错

#include "stdafx.h"


#include <iostream>

#include <fstream>

#include <string>



#include <stdlib.h>


using namespace std;


int _tmain(int argc, _TCHAR* argv[])

{

	bool isKey(string str);

	bool isNum(string str);

	bool isOper(string str);

	bool isID(string str);


	string SYM;

	string NUM;

	string ID;

	string OPER;


	int con=0;


	ifstream fin("test.cpp");  

    string str;  


    while(fin>>str) 

    {    

		cout<<str;


			 

		if (isKey(str))

		{

			string str2=str+"SYM";

			SYM=SYM+" "+str2;

			con=1;

			cout<<"关键字："<<str<<endl;

			cout<<SYM<<endl;

			continue;

		}


		if(isNum(str))

		{

			SYM=SYM+" "+"NUMBER";

			NUM=NUM+" "+str;

			con=2;

			cout<<"数："<<str<<endl;

			continue;


		}


		if(isOper(str))

		{

			SYM=SYM+" "+"OPER";

			OPER=SYM+" "+str;

			con=3;

			cout<<"运算符："<<str<<endl;

			continue;

		}


		if(isID(str))

		{

			SYM=SYM+" "+"IDENT";

			ID=ID+" "+str;

			con=4;

			cout<<"标识符："<<str<<endl;

			continue;

		}


		if(con==0) 

		{

			cout<<"wrong input"<<endl;

			continue;

		}

	  


	}

	fin.close();  


	system("pause");

}

 


bool isKey(string str)

{

	string key[]={"char","short","int","unsigned","long","float","double","struct","union","void","enum","signed","const","volatile","typedef","auto","register","static","extern","break","case","continue","default","do","else","for","goto","if","return","switch","while","sizeof","inline","catch","dynamic_cast","mutable","protected","true","false","namespace","public","try","bool","typename","class","delete","new","template","using","explicit","operator","reinterpret","cast","this","typeid","virtual","const_cast","friend","private","throw","static","cast","asm","wchar","export"};

	int n=sizeof(key);

	int i=0;

	do

		{

			if (str==key[i])

				return true;

			i++;

		}while(i<n);

		if (i==n) return false;

}



bool isNum(string str)

{

	int len=str.length();


	for(int i=0;i<len;i++)

	{

		char ch=str[i]; 

		if (ch<48||ch>57)

			return false;

	}

	return true;

}



bool isOper(string str)

{

	string cal[]={"+","-","+=","-=","&=","^=","|=","/=","<<=","%=","*=",">>=","-=","<&","^","|","%%","||",",","?:",".*","&","::","/","%","*","()","->","--","++","[]","==",">=","<=","<",">","!=","<<",">>","+","!","~"};

	int n=sizeof(cal);

	int i=0;

	while(i<n)

		{

			if (str==cal[i])

				return true;

			i++;

		}

	if (i==n) return false;

}



bool isID(string str)

{

	string first="_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

	string following="_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";


	string::size_type pos; 


	pos= first.find(str[0]);  

	if(pos == first.npos) 

		return false;


	int len=str.length();

	for (int i=1;i<len;i++)

	{

		pos= following.find(str[i]);

		if(pos == first.npos) 

			return false;

	}


	return true;



}

谢谢各位！！
------解决方案--------------------
string x[] = {...};
int len = sizeof(str);  ===>>>>>  WRONG !!!
------解决方案--------------------
sizeof(key);是数组中总字节数,而不是数组中的元素总个数.

如果想求得元素个数, 需要作个除法.

nCount = sizeof(key)/sizeof(key[0]);