Program.cs

using System;

class Program
{
    static void Main()
    {
        int[,] matriksA = {
            {1, 2},
            {3, 4}
        };
        
        int[,] matriksB = {
            {5, 6},
            {7, 8}
        };

        int[,] hasil = PerkalianMatriks(matriksA, matriksB);

        Console.WriteLine("Hasil Perkalian Matriks:");
        CetakMatriks(hasil);
    }

    static int[,] PerkalianMatriks(int[,] A, int[,] B)
    {
        int barisA = A.GetLength(0);
        int kolomA = A.GetLength(1);
        int barisB = B.GetLength(0);
        int kolomB = B.GetLength(1);

        if (kolomA != barisB)
        {
            throw new InvalidOperationException("Jumlah kolom matriks A harus sama dengan jumlah baris matriks B");
        }

        int[,] hasil = new int[barisA, kolomB];

        for (int i = 0; i < barisA; i++)
        {
            for (int j = 0; j < kolomB; j++)
            {
                hasil[i, j] = 0;
                for (int k = 0; k < kolomA; k++)
                {
                    hasil[i, j] += A[i, k] * B[k, j];
                }
            }
        }

        return hasil;
    }

    static void CetakMatriks(int[,] matriks)
    {
        int baris = matriks.GetLength(0);
        int kolom = matriks.GetLength(1);

        for (int i = 0; i < baris; i++)
        {
            for (int j = 0; j < kolom; j++)
            {
                Console.Write(matriks[i, j] + " ");
            }
            Console.WriteLine();
        }
    }
}