Passing arrays through functions w/bubble sort.

[HotSoup]

My Assignment:
Create two arrays data and sdata. Input user data into array data. Copy the contents of array data into sdata. Then bubble sort the array sdata in ascending order. Then display the contents of array data and sdata. Use four void functions for input, copying, sorting and displaying.

Current Problem:
I can't figure out why my array data[] is being displayed out of the original order that it was input via input function. Any hints as to why this is happening? I've been stuck on this for several hours now...any help is appreciated.

#include <iostream>

using namespace std;

//input function
void input(double x[], int length)
{
  for(int i = 0; i < length; i++)
  {
    cout << "Enter a score: ";
    cin >> x[i];
  }
}

//copy function
void copy(double source[], double dest[], int length)
{
  for(int i = 0; i < length; i++)
  {
    dest[i]=source[i];
  }
}

//sort function
void sort(double x[], int length)
{
  double temp;
  for(int j = (length - 1); j > 0; j--)
  {
    for(int i = 1; i < length; i++)
    {
      if(x[i-1] > x[i])
        {
          temp = x[i];
          x[i] = x[i-1];
          x[i-1] = temp;
        }
    }
  }
}

//display function
void display(double x[], int length)
{
  for(int i = 0; i < length; i++)
  {
    cout << x[i] << ' ';
  }
}

int main()
{
  //declare & initialize variables
  int maxLength = 0;
  double data[maxLength];//original array
  double sdata[maxLength];//sorted array

  cout << "Please enter the data item count <1-20>: ";
  cin >> maxLength;

  cout << endl;
  if(maxLength > 0 && maxLength < 21)//validate item count
  {
    input(data, maxLength);//call void input function
  }
  else
  cout << "\nItem count is NOT within required range.\nRequired range is 1 to 20.\n";

  copy(data, sdata, maxLength);
  sort(sdata, maxLength);

  //display the data within the arrays
  cout << "\nOriginal Data: ";
  display(data, maxLength);
  cout << "\nSorted Data: ";
  display(sdata, maxLength);
  cout << endl;

  return(0);
}

[HotSoup]

I'm using Code::Blocks 10.05 and listening to Caravan Palace...

[HotSoup]

Ugh. I moved the display(data,maxLength) above the copy/sort calls and everything is working now.