How do you dynamically allocate a matrix?

Question

How do you dynamically allocate a 2D matrix in C++? I have tried based on what I already know:

#include 

int main(){
    int rows;
    int c         


        

Answer 1

 #include 

    int main(){
        int rows=4;
        int cols=4;
        int **arr;

        arr = new int*[rows];
        for(int i=0;i