Sum main diagonal of square matrix {{1,2,3},{4,5,6},{7,8,9}} (1+5+9=15).
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using System;
class Program
{
static void Main()
{
int[,] m = { {1,2,3}, {4,5,6}, {7,8,9} };
int sum = 0;
for (int i = 0; i < m.GetLength(0); i++)
sum += m[i, i];
Console.WriteLine(sum);
}
}Prefer Coach (Nudge → Guide → Approach) before revealing. No forced signup.
Main diagonal: indices where row equals column.
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