Question

logarithimic diagram of matrix multiplication by c++ language

Answer 1

// C++ program to multiply two matrices

#include <bits/stdc++.h>
using namespace std;

// Edit MACROs here, according to your Matrix Dimensions for
// mat1[R1][C1] and mat2[R2][C2]
#define R1 2 // number of rows in Matrix-1
#define C1 2 // number of columns in Matrix-1
#define R2 2 // number of rows in Matrix-2
#define C2 3 // number of columns in Matrix-2

void mulMat(int mat1[][C1], int mat2[][C2])
{
    int rslt[R1][C2];

    cout << "Multiplication of given two matrices is:\n";

    for (int i = 0; i < R1; i++) {
        for (int j = 0; j < C2; j++) {
            rslt[i][j] = 0;

            for (int k = 0; k < R2; k++) {
                rslt[i][j] += mat1[i][k] * mat2[k][j];
            }

            cout << rslt[i][j] << "\t";
        }

        cout << endl;
    }
}

// Driver code
int main()
{
    // R1 = 4, C1 = 4 and R2 = 4, C2 = 4 (Update these
    // values in MACROs)
    int mat1[R1][C1] = { { 1, 1 }, { 2, 2 } };

    int mat2[R2][C2] = { { 1, 1, 1 }, { 2, 2, 2 } };

    if (C1 != R2) {
        cout << "The number of columns in Matrix-1 must "
                "be equal to the number of rows in "
                "Matrix-2"
            << endl;
        cout << "Please update MACROs according to your "
                "array dimension in #define section"
            << endl;

        exit(EXIT_FAILURE);
    }

    // Function call
    mulMat(mat1, mat2);

    return 0;
}

Output

Multiplication of given two matrices is:

3    3    3   

6    6    6