sum of the diagonal of a matrix

[Dani17q]

Hey folks, I am having problems with sumMajorDiagonal function. I am suppose to create that function so that the program adds the fist diagonal of the matrix, but my function its not delivering that result.

#include <iostream>

using namespace std;

const int SIZE = 4;
double sumMajorDiagonal(const double m[][SIZE], int row, int column, /*int i, int j*/) { //create a function that sums the first diagonal in a matrix
double sumDiagonal = 0;

// Loop to sum main diagonal
for (int i = 0; i<row; i++)
{
for (int j = 0; j<column; j++)
{
if (i == j)
sumDiagonal = sumDiagonal + [i][j];
}
}



return sumDiagonal;

}



int main() {
const int columns = 4;
const int rows = 4;
int columnIndex = 0;


double myArr[columns][rows], i, j, diagonal = { 0 }; //declare "myarr"

cout << "Enter a 4-by-4 matrix row by row : " <<endl; //ask user value input
for (i = 0; i < 4; i++) {
for (j = 0; j, 4; j++) {
cin >> myArr[columns][rows];
}

}





cout << "\nSum of main diagonal elements is " /*<< sumDiagonal*/;
return 0;
}

[48T7M4Gy]

http://www.cplusplus.com/forum/beginner/212528/