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Array~C++ HELP

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http://www.daniweb.com – Write a function that accepts an int array and the array’s size as arguments. The function should create a new array that is twice the size of the argument array. The function should copy the contents of the argument array to the new array. I tried to run on it, but it doesnt work.....what's going on?? please let me. thanks #include "stdafx.h" #include <iostream> using namespace std; int *duplicateArray(const int *, int); void displayArray(int[], int); int _tmain(int argc, _TCHAR* argv[]) {         // Define constants for the array sizes.         const int SIZE1 = 5, SIZE2 = 7, SIZE3 = 10;                 // Define three arrays of different sizes.         int array1[SIZE1] = { 100, 200, 300, 400, 500};         int array2[SIZE2] = { 10, 20, 30, 40, 50, 60, 70};         int array3[SIZE3] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};                 // Define three pointers for the duplicate arrays.         int *dup1, *dup2, *dup3;         // Duplicate the arrays.         dup1 = duplicateArray(array1, SIZE1);         dup2 = duplicateArray(array2, SIZE2);         dup3 = duplicateArray(array3, SIZE3);                 // Display the original arrays.         cout << " Here is ....." << endl;         displayArray(array1, SIZE1);         displayArray(array2, SIZE2);         displayArray(array3, SIZE3);                 // Display the new array.         displayArray(dup1, SIZE1);         displayArray(dup2, SIZE2);         displayArray(dup3, SIZE3);         delete [] dup1;         delete [] dup2;         delete [] dup3;         dup1 = 0;         dup2 = 0;         dup3 = 0;         return 0; } int *duplicateArray(const int *arr, int size) {                 int *newArray;                 if (size< 0)                         return NULL;                 newArray = new int[size * 2];                         // Copy the array's contents to the new array.                 for( int index = 0; index < size; index++)                         for (int index =0; index < size * 2; index++)                                 newArray[index] = arr [index];                 // Return a pointer to the new array.                 return newArray; } void displayArray(int arr[], int size) {                 for(int index= 0; index < size * 2; index++)                         cout << arr[index] << " ";                 cout << endl; } (General)