Calculating the sum of diagonal elements and then finding the difference in C++

 

                          #add of diagonal of 2d array                          

#include <iostream>
using namespace std;
#include <math.h>
int main() {
    int arr[3][3] = {1, 4, 2, 5, 2, 8, 2, 5, 9};
    int sum1 = 0 , sum2 = 0; 
    for (int i = 0; i < 3; i++) {
        sum1 += arr[i][i]; 
        sum2 += arr[i][2 - i]; 
    }
    int d = abs(sum1 - sum2);
    cout << "Sum of diagonal1: " << sum1 << endl;
    cout << "Sum of diagonal2: " << sum2 << endl;
    cout << "Diff between the sums: " << d << endl;
    return 0;
}