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Main diagonal sum

Java Loops

loop over diagonal

Flowchart (ISO 5807)

StartInput a, nsum = 0i = 0, n - 1, 1sum += a[i][i]Return sumEndFigure 1 — diagonalSum

Source code

static int diagonalSum(int[][] a, int n) {
    int sum = 0;
    for (int i = 0; i < n; i++) {
        sum += a[i][i];
    }
    return sum;
}