Finding Max and Min Value

Hi,
The problem is that I have a program which processes a 2D array. One task is to find the min and max of one column (ignoring the second). Here is my code so far:

Code:

---

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

using namespace std;

double data[4][2]; // declare 2D array for data in file.
int count;
int noOfReadings;
int counter=0;
int numberOfSpeedIntervals;
int numberOfSectors;

int main()
{
 ifstream inPutFile;//Creates stream to input file.
 inPutFile.open("c:\\grade.txt");//Opens stated file.

 if (!inPutFile)//Deals with problems opening file.
      cout << "Error opening file!" << endl;

//Finds how many lines of data there are.
int item;
while (!inPutFile.eof())
{
inPutFile >> item;
counter++;
}
const int rows = (counter/2);
cout<<"Number of rows: "<<rows<<endl;

cout<<"Please type how many intervals do you require: ";
cin>> numberOfSpeedIntervals;

cout<<"Please type how many sectors do you require: ";
cin>> numberOfSectors;

//initialise current max and min
  // find max and min
  // initialise current max and min
  double maxRead = data[i][0];
  double minRead = data[i][0];
 
  for (int i = 1; i < data; i++)
  {
 
    if (maxRead < data[i])
    {
        maxRead = data[i];
    }
   
    if (minRead > data[i])
    {
        minRead = data[i];
    }   
 
  }

      system("PAUSE");
      return 0;
}

---

The last lines are faulty. Any ideas?

Will

for (int i = 1; i < data; i++)
the limit is incorrect - should be 4 (best declare it as const somewhere and use in every place in the code you need the array size)

Thanks,
I changed data to rows which is the user set variable set by user. Code now reads:

Code:

---

.
.
.
.
while (!inPutFile.eof())
{
inPutFile >> item;
counter++;
}
const int rows = (counter/2);
cout<<"Number of rows: "<<rows<<endl;
.
.
.
.
//initialise current max and min
  // find max and min
  // initialise current max and min
  double maxRead = data[0][0];
  double minRead = data[0][0];
 
  for (int i = 1; i < rows; i++)
  {
 
    if (maxRead < data[i][0])
    {
        maxRead = data[i][0];
    }
   
    if (minRead > data[i][0])
    {
        minRead = data[i][0];
    }   

  cout<<"Min= "<<minRead<<endl;
  cout<<"Max= "<<maxRead<<endl;

  }

      system("PAUSE");
      return 0;
}

---

I get max and min returned as zero. Any ideas?
Cheers
Will

you havn't initialized the data array