Word Counter

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
void mangle(string& word);

int main()
{
    vector <string> words;
    vector <string> allWords;
    vector <int> frequencies;

    string fileLocation;
    cout<<"Enter a file location:"<<endl;
    cin>>fileLocation;

    int freq = 0;
    int currentMax = -10;
    int currentMaxIndex;
    float count = 0;
    int amtOfTopWords;

    cout<<"\nEnter the amount of words you want to see the most used of:"<<endl;
    cin>>amtOfTopWords;

    ifstream file;

    file.open(fileLocation.c_str());
    while(!file.eof())
    {
        bool distinct = true;
        string word;
        file>>word;
        mangle(word);
        if(words.size() > 0)
        {
            for(int i=0; i < words.size(); i++)
            {
                if(word == words[i])
                {
                    distinct = false;
                    count++;
                    allWords.push_back(word);
                    break;
                }
            }
        }
        if(distinct == true)
        {
            words.push_back(word);
            allWords.push_back(word);
            count++;
        }
    }
    for(int i = 0; i < words.size(); i++)
    {
        for(int a = 0; a < allWords.size(); a++)
        {
            if(words[i] == allWords[a])
            {
                freq++;
            }
        }
        frequencies.push_back(freq);
        freq = 0;
    }
    cout<<"\n\nThe Top "<<amtOfTopWords<<" Most Used Words and Their Frequencies"<<endl;
    cout<<"-----------------------------------------------"<<endl;
    for(int i = 0; i < amtOfTopWords; i++)
    {
        for(int a = 0; a < frequencies.size(); a++)
        {
            if(frequencies[a] > currentMax)
            {
                currentMax = frequencies[a];
                currentMaxIndex = a;
            }
        }
        cout<<i+1<<") "<<words[currentMaxIndex]<<" -- "<<currentMax<<endl;
        currentMax = -10;
        frequencies[currentMaxIndex] = 0;
    }
    cout<<"\n\nWord Data"<<endl;
    cout<<"---------"<<endl;
    cout<<"There are "<<count<<" words and "<<words.size()<<" distinct words.\n\n\n";
    system("pause");
}
void mangle(string& word)
{
    vector <string> garbage;
    for(int i = 0; i < word.size(); i++)
    {
        word[i] = tolower(word[i]);
        if(word[word.length()-1] == '\'')
        {
            word.erase(word.length()-1,1);
        }
        if(word[0] == '\'')
        {
            word.erase(0,1);
        }
        if(!(word[i] >= '\'' && word[i] <= 'z')  || ((word[i] < '0' && word[i] > '\'') || (word[i] < '\'') || (word[i] > '9' && word[i] < '\`')))
        {
            word.erase(i,1);
        }
    }
}