improve 2D array in C++ - c++

Question

This is may code for 2D array. I will using it for Battleship game.
I want to ask, if its necessary to use a dynamic memory because I have two 2D array. Also I want to ask if anyone can tell my how to improve or fix my code
I'm not sure that I used the Class correct, but its my first time
enter code here
#include <iostream>
#include<array>
#include <string>
#include <stdlib.h>
#include <vector>
using namespace std;
class Board {
public:
int grid[15][15];
int initBoard(int A, int B)
{
int grid[A][B];
for(int col=0; col<A; col++) //Outer column loop
{
for(int row=0; row<B; row++) //Inner row loop
{
grid[col][row]=0;
}
}
}
void printBoard(int A, int B)
{
if (B == 10){
cout<<endl;
cout<<" ---{WELCOME TO THE BATTLESHIP}---\n"<<endl;
cout << " 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |" << endl << endl;
}
else if (B == 15){
cout<<endl;
cout<<" ---{WELCOME TO THE BATTLESHIP}---\n"<<endl;
cout << " 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10| 11| 12| 13| 14|" << endl << endl;
}
for(int i=0; i<A; i++) //column loop
{
for(int j=0; j<B; j++) //row loop
{
if(j==0)
{
if(i<=9){
cout << i << " " ; //print row number and spaces before new row
}
else if(i>=10){
cout << i << " " ;
}
}
grid[i][j]=0;
cout << grid[i][j] ;
if(j <= B)
{
cout << " | ";
}
}
cout << endl; //new line at end of column
}
cout << endl;
}
}:
int main(){
system("clear");
cout<<endl;
cout<<"***------GAME MENU------***"<<endl<<endl;
int b;
string name;
string surname;
cout<<" Choose Difficulty\n\n"<<" 1 for Easy\n"<<" 2 for
Hard\n"<<endl;
cout<<"***---------------------***"<<endl<<endl;
cout<<"Enter your name: ";
cin>>name;
cout<<"Enter your surname: ";
cin>>surname;
cout<<"Enter your choice -->";
cin>>b;
system("clear");
if (b==1){
Board easy;
easy.initBoard(10,10);
easy.printBoard(10,10);
cout<<endl;
}
else if(b==2){
Board hard;
hard.initBoard(15,15);
hard.printBoard(15,15);
cout<<endl;
}
return 0;
}

Answer 1

if its necessary to use a dynamic memory because I have two 2D array.
On my system, Ubuntu 17.10, each thread stack size is 8 MB (default). You need to figure out your per thread auto-var size, and if your grid is smaller, and enough size is left for max depth function calls, you will not need to use dynamic memory.
Generally, I would not resist using dynamic memory.
Because I have 2D array
The dimensionality has no impact. The grid (made with std::array) takes a fixed number of bytes, and the elements are back to back.