Multi-dimensional arrays

[LoneImprover]

Hello, got stuck (again) and this time with arrays.
My task is:
In a text file there is given a multi-dimensional array, which is made n rows and m columns.
Find the positive elements that are under main istrižaine (doesn't translates but in an array istrizaine is a11;a22;a33 and so on) sum them and the negative numbers wich are above istrizaine multiply.

  #include <cstdlib>
#include <iostream>
#include <fstream>

using namespace std;

int main(int argc, char *argv[])
{
    const int N=40;
    int a[N][N];

    cout << "Raskite teigiamu elementu, esanciu po pagrindine istrižaine, suma ir neigimu elementu, esanciu virš pagrindines istrižaines, sandauga."<<endl;
    ifstream f("text.txt");
    if( f.fail()){
    cout<< "Nerastas failas";
    }
    int m,n, sum=0, sand=0;
    f >> n >> m;
    for(int i=0; i<n; i++){
        for(int j=0; j<m; j++){
                f >> a[i][j];
    
    if(i>j&&a[i][j]>0){
        //f >> a[i][j];
            cout<<"\t" <<a[i][j]<<endl;
            }
    if(i<j&&a[i][j]<0){
        cout <<"\t" << a[i][j]<<endl;
    }
            }
        cout<<endl;
        }



    f.close();
    cin.get();
    return EXIT_SUCCESS;
}

Now my problem is I don't know how to add the positive numbers that I get and how to multiply the negatives ones.

[lastchance]

The problem I have is that the program doesn't find the proper numbers.

The problem you have is that you read half the numbers twice (on lines 21 and 24)

- Open the file
- Read ALL the numbers
- Close the file

THEN start doing the processing once you have the whole array stored.

[LoneImprover]

Thanks lastchance.