Go4Expert - Processing two-dimensional arrays

The program is constantly reporting an error and I cannot debug it. The problem is that I don't know what is actually wrong... can someone just tell me where I made a mistake?
Code:
#include <iostream>

#include <string>

#include <iomanip>

#include <fstream>



using namespace std;



const int NUMBER_OF_ROWS = 7;

const int NUMBER_OF_COLUMNS = 6;



int matrix[NUMBER_OF_ROWS][NUMBER_OF_COLUMNS];

int row;

int col;

int sum;

int largest;

int temp;







int main()

{



        row = 4;

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

matrix[row][col] = 0;





for (row = 0; row < NUMBER_OF_ROWS; row++)

{

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

cout << setw(5) << matrix[row][col] << " ";

cout << endl;

}





for (row = 0; row < NUMBER_OF_ROWS; row++)

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

cin >> matrix[row][col];





sum = 0;

row = 4;

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

sum = sum + matrix[row][col];





//Sum of each individual row

for (row = 0; row < NUMBER_OF_ROWS; row++)

{

sum = 0;

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

sum = sum + matrix[row][col];

cout << "Sum of row " << row + 1 << " = " << sum << endl;

}





//Sum of each individual column

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

{

sum = 0;

for (row = 0; row < NUMBER_OF_ROWS; row++)

sum = sum + matrix[row][col];

cout << "Sum of column " << col + 1 << " = " << sum

<< endl;

}





row = 4;

largest = matrix[row][0]; //Assume that the first element of

//the row is the largest.

for (col = 1; col < NUMBER_OF_COLUMNS; col++)

if (largest < matrix[row][col])

largest = matrix[row][col];







//Largest element in each row

for (row = 0; row < NUMBER_OF_ROWS; row++)

{

largest = matrix[row][0]; //Assume that the first element

//of the row is the largest.

for (col = 1; col < NUMBER_OF_COLUMNS; col++)

if (largest < matrix[row][col])

largest = matrix[row][col];

cout << "The largest element in row " << row + 1 << " = "

<< largest << endl;

}

//Largest element in each column

for (col = 0; col < NUMBER_OF_COLUMNS; col++)

{

largest = matrix[0][col]; //Assume that the first element

//of the column is the largest.

for (row = 1; row < NUMBER_OF_ROWS; row++)

if (largest < matrix[row][col])

largest = matrix[row][col];

cout << "The largest element in column " << col + 1

<< " = " << largest << endl;

}