WIerd Vector Error

This is my text analyzer program for school it is getting this error not a debug error but in the console:

Illegal vector index: 2 max index = 1

here is my code

Code:

#include<fstream.h>
#include<iomanip.h>
#include<iostream.h>
#include"apvector.h"
#include"apstring.h"
ofstream fout;

apstring getfile(apstring &);
void foutopen(apstring &);
void letterfrequency(apvector <int> &, apstring); 
void getwords(apvector <apstring> &, apstring); 
void wordfrequency(apvector<int> &, apvector<apstring>); 
void output(apvector<int>, apvector<int>, apvector <apstring>, apstring); 
void sort(apvector<apstring> &, int, int);
int part(apvector<apstring> &, int, int); 

// Daniel Meade, Per 4, 2/2/06, Advanced Programming
// This is the madlib

int main()
{
 	apstring text, filename;
 	apvector <int> letfreq(26,0);
 	apvector <apstring> words;
 	char ch;
 	do
 	{
 		text=getfile(filename);
 		foutopen(filename);
 		letterfrequency(letfreq, text);
 		getwords(words, text);
 		sort(words, 0,words.length()-1);
 		apvector<int>wordfreq(words.length()-1);
 		wordfrequency(wordfreq, words);
 		output(letfreq, wordfreq, words, filename);
 		cin.get(ch);
 	}while(ch!='n'&&ch!='N');
 	fout.close();
 }
 apstring getfile(apstring & filename)
 {
 	ifstream fin;
 	char let;
 	apstring text;
 	
 	cout<< "Input Filename Please:";
 	getline(cin, filename);
 	
 	fin.open(filename.c_str());
 	while (fin.fail())
 	{
 		cout << " Invalid File: "<< endl << " Input Filename Please:";
 		getline(cin, filename);
 	}
 	do
 	{
 		fin.get(let);
 		if(let>='a'&&let<='z')
 		let-=32;
 		text+=let;
 	}
 	while(!fin.eof());
 	
 	fin.close();
 	
 	return text;
 }
 void letterfrequency(apvector<int> & letfreq, apstring text) 
{
 	for(int c=0; c<text.length(); c++)
 	
 		if(text[c]>='A'&& text[c]<='Z')
 		
 			letfreq[text[c]-'A']++;
 		
 }
 
 
 void getwords(apvector<apstring> &words, apstring text)
 {
 	apstring word ="";
 	for(int c=0;c<text.length();c++)
 	{
 		if(text[c]>='A' &&text[c]<='Z'||text[c]=='\' '&& word !="")
 			word+=text[c];
 		else if (word!="")
 		{
 			words.resize(words.length()+1);
 			words[words.length()-1]=word;
 			word="";
 		}
 	}
 }
 void wordfrequency(apvector<int> & wordfreq, apvector<apstring>words)
 {
 	int cnt=0;
 	for (int c=0; c<words.length()-1;c++)
 	{
 		if(words[c]==words[c+1])
 			cnt++;
 		else
 		{
 			wordfreq[c]=cnt+1;
 			cnt=0;
 		}
 	}
 }
 void output(apvector<int>letfreq, apvector<int> wordfreq, apvector<apstring>words, apstring filename)
 {
 	fout << " The frequency if the letters..."<< endl;
 	for(int c=0; c<26-3;c+=3)
 	{
 		fout << char(c+'A') << '_' << letfreq[c] << "\t\t\t"
 			<< char(c+'B') << '_' << letfreq[c+1] << "\t\t\t"
 			<< char(c+'C') << '_' << letfreq[c+2] << endl;
 	}
 	fout << endl << "The disctinct words...." << endl;
 	for(int c=0;c<words.length();c++)
 		if(wordfreq[c]!=-1)
 			fout << words[c] << '_' << wordfreq[c] << endl;
 	fout << endl << "There were " << words.length() << "words";
 	cout << endl << "\nCheck the text file:" << filename;
 	cout << "\n\nDo you want to continue?(y/n)";
 }
 void foutopen(apstring &filename)
 { 
 	int c;
 	for(c=filename.length()-1; c>=0;c--)
 		if(filename[c]=='.')
 			break;
 	filename=filename.substr(0,c)+"h:\\out.txt";
 	fout.open(filename.c_str());
 }
 void sort(apvector<apstring> &words, int first, int last)
 {
 	int pivot = 0;
 	if(first < last)
 	{
 		pivot=part(words,first,last);
 		sort(words,first,(pivot-1));
 		sort(words,(pivot+1),last);
 	}
 }
 int part(apvector<apstring> & words, int first, int last)
 {
 	int firstpos, lastpos;
 	apstring firstword = words[first],temp;
 	firstpos = first;
 	lastpos=last;
 	do
 	{
 		while (words[firstpos] <= firstword && firstpos < last)
 		firstpos ++ ;
 		while (words [lastpos] > firstword && lastpos > first)
 		lastpos--;
 		if(firstpos < lastpos)
 		{
 			temp = words[firstpos];
 			words[firstpos] = words[lastpos];
 			words[lastpos] = temp;
 		}
 	}
 	while (lastpos > firstpos);
 	words[first] = words[lastpos];
 	words[lastpos] = firstword;
 	return lastpos;
 }

Thanks guys i appreciate it alot

1) You don't read from files with a loop condition like this:

while(!fin.eof())

What happens if there is a stream error before you hit eof which prevents you from reading from the file anymore?

2) Use at() instead of [], and get the compiler error and the line number.

Ok, so what code did you add before you got that error? It would help if you narrowed down the problem to a certain code segment (especially since we can't compile what you've posted without apstring/apvector headers)

What I will say is that you're using outdated code.

Code:

#include<fstream.h>
#include<iomanip.h>
#include<iostream.h>

Those are all deprecated headers. You should use:

Code:

#include <fstream>
#include <iomanip>
#include <iostream>
using namespace std;

And if that won't compile, you need a new compiler.

>> Those are all deprecated headers.
Not even deprecated.. they're completely non-standard.

i know stupid school is dumb and wont change curriculum or compilers.........

Your school won't change... but you can. If you have your own box, install Intel/gcc/some standard compiler and learn good programming practices (eg. here)

Code:

cout<< "Input Filename Please:";
getline(cin, filename);

fin.open(filename.c_str());
while (fin.fail())
{
    cout << " Invalid File: "<< endl << " Input Filename Please:";
    getline(cin, filename);
}

When will that ever work? You get a new filename but you don't use it to open the file? Once you enter the while loop, the fail state is never going to change.