Unexpected abort in C++ - c++

Question

I have a piece of code I'm running in Cygwin in C++ I'm compiling using
g++ -o program program.cpp
And it is returning an error that reads 'Aborted (core dumped)'. It is intended to take a file name as input through a command line argument, count all the unique words and total words in the file, and prompts the user to input a word and counts how many times the word that they input occurs. It's only intended to use C++ streams for input/output.
#include <fstream>
#include <iostream>
#include <string>
#include <cctype>
using namespace std;
int main(int argc, char *argv[])
{
string filename;
for( int i = 1; i < argc; i++){
filename+=argv[i];
}
ifstream file;
file.open(filename.c_str());
if (!file)
{
std::cerr << "Error: Cannot open file" << filename << std::endl;
return 1;
}
string* words;
int* wordCount;
int wordLength = 0;
string curWord = "";
bool isWord;
int total = 0;
char curChar;
string input;
while(!file.eof())
{
file.get(curChar);
if (isalnum(curChar)) {
curWord+=tolower(curChar);
}
else if (!curWord.empty() && curChar==' ')
{
isWord = false;
for (int i = 0; i < wordLength; i++) {
if (words[i]==curWord) {
wordCount[i]++;
isWord = true;
total++;
}
}
if (!isWord) {
words[wordLength]=curWord;
wordLength++;
total++;
}
curWord="";
}
}
file.close();
// end
cout << "The number of words found in the file was " << total << endl;
cout << "The number of unique words found in the file was " << wordLength << endl;
cout << "Please enter a word: " << endl;
cin >> input;
while (input!="C^") {
for (int i = 0; i < wordLength; i++) {
if (words[i]==input) {
cout << wordCount[i];
}
}
}
}

Answer 1

You never allocated any space for words and wordCount to point to. It should be:
#define MAXWORDS 1000
string *words = new string[MAXWORDS];
int *wordCount = new int[MAXWORDS];
and then at the end of the program you should do:
delete[] wordCount;
delete[] words;
or you can allocate a local array:
string words[MAXWORDS];
int wordCount[MAXWORDS];
But you could do it more simply by using std::map to map the string to a count. This will automatically grow as needed.