When you dynamically assign a C language array...

#include <stdio.h>

int main()
{
    int * arr1 = (int *)malloc(sizeof(int) * 6);
    int * arr2 = (int *)malloc(sizeof(int) * 6);
    int * arr3 = (int *)malloc(sizeof(int) * 6);

    arr1[3][2] = {
        {3, 4},
        {5, 2},
        {1, 2},
    };

    arr2[3][2] = {
        {1, 2},
        {7, 9},
        {3, 5}
    };

    for (int i = 0; i < 3; i++)
        for (int j = 0; j < 2; j++)
            arr3[i][j] = arr1[i][j] * arr2[i][j];


    for (int i = 0; i < 3; i++)
        printf("%d %d\n", arr3[i][0], arr3[i][1]);

    free(arr1);
    free(arr2);
    free(arr3);
    return 0;
}