194: Write a program in C++. In this program you have to declare 2-D array of size 7x7 having type as integer. Populate this array with user input values and then display the sum of all the left diagonal entries in this array.

 

// Write a program in C++. In this program you have to declare 2-D array of size 7x7 having type as integer.
// Populate this array with user input values and then display the sum of all the left diagonal entries in this array.

#include <iostream>
using namespace std;
int main()
{
    int r_size, c_size;
    cout << "Enter the size of rows: ";
    cin >> r_size;
    cout << "Enter the size of column: ";
    cin >> c_size;

    int array[r_size][c_size];

    for (int i = 0; i < r_size; i++)
    {
        for (int j = 0; j < c_size; j++)
        {
            cout << "Enter element in row index " << i << " and column index " << j << ": ";
            cin >> array[i][j];
        }
    }

    system("cls");

    for (int i = 0; i < r_size; i++)
    {
        for (int j = 0; j < c_size; j++)
        {
            cout << array[i][j] << ' ';
        }
        cout << endl;
    }

    int sum = 0;
    for (int i = 0; i < r_size; i++)
    {
        for (int j = 0; j < c_size; j++)
        {
            if (i == j)
            {
                sum += array[i][j];
            }
        }
    }

    cout << "The left diagonal sum: " << sum << endl;

    return 0;
}


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