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C++, pasted on Jun 1: 
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#include <iostream>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;
 
const int n = 5;
const int m = 5;
void show_arr(ostream & os, int arr[n][m])
{
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
            os << setw(3) << arr[i][j];
        os << '\n';
    }
}
int main()
{
    srand(unsigned (time(0)));
    ofstream fout;
    cout << "Enter the name of file: ";
    string name;
    getline(cin, name);
    fout.open(name.c_str());
    int arr[n][m];
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            if (rand() % 2)
                arr[i][j] = rand() % 6;
            else
                arr[i][j] = -(rand() % 6);
 
    show_arr(cout, arr);
    show_arr(fout, arr);
 
    /*for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
            cout << setw(3) << arr[i][j];
        cout << '\n';
    }
    cout << '\n';*/
 
    int sum_odd(0);
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            if (i % 2 || i == 1)
                if (j % 2 || j == 1)
                    sum_odd += arr[i][j];
    cout << "\nThe sum of odd numbers is " << sum_odd << '\n';
    fout << "\nThe sum of odd numbers is " << sum_odd << '\n';
 
    int first_i, first_j, last_i, last_j;
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            if (arr[i][j] < 0)
            {
                first_i = i;
                first_j = j;
                i = n;
                j = m;
            }
 
    for (int i = n-1; i >= 0; i--)
        for (int j = m-1; j >= 0; j--)
            if (arr[i][j] < 0)
            {
                last_i = i;
                last_j = j;
                i = -1;
                j = -1;
            }
 
    int sum_between(0);
    for (int i = first_i; i < last_i + 1; i++)
        if (i == first_i)
            for (int j = first_j; j < m; j++)
                sum_between += arr[i][j];
        else if (i == last_i)
            for (int j = 0; j < last_j + 1; j++)
                sum_between += arr[i][j];
        else
            for (int j = 0; j < m; j++)
                sum_between += arr[i][j];
    cout << "The sum between first and last negative elements is " << sum_between << "\n\n";
    fout << "The sum between first and last negative elements is " << sum_between << "\n\n";
 
    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
            if (arr[i][j] < 0)
            {
                if (-(arr[i][j]) <= 1)
                    arr[i][j] = 0;
            }
            else
                if (arr[i][j] <= 1)
                    arr[i][j] = 0;
 
    show_arr(cout, arr);
    show_arr(fout, arr);
    /*for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < m; j++)
            cout << setw(3) << arr[i][j];
        cout << '\n';
    }
    cout << '\n';*/
    fout.close();
}


Output: 
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cc1plus: warnings being treated as errors
In function 'int main()':
Line 55: warning: 'first_i' may be used uninitialized in this function
Line 55: warning: 'first_j' may be used uninitialized in this function
Line 55: warning: 'last_j' may be used uninitialized in this function
Line 55: warning: 'last_i' may be used uninitialized in this function


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