Need help with creating arrays outiside functions

[kaylors]

okay so straight out, i need my arrays and their size integer variable to be global functions, but my compiler isn't accepting it. i use dev c++. so what do i do?

#include<iostream.h>

using namespace std;

int size;

char Field[size][size];
char Ground[size][size];

void Diff()
{
     char ch;
     
    cout<<"Please select a level of Difficulty:"<<endl;
    cout<<"E.Easy"<<endl;
    cout<<"M.Medium"<<endl;
    cout<<"D.Difficulty"<<endl;
    cout<<endl<<"Choice:";
    
    cin>>ch;
    
    if(ch=='E') size=9;
    if(ch=='M') size=17;
    if(ch=='D') size=25;
}

that's the code

[laserlight]

The size must be a compile time constant.

You probably do not need to use global variables. I suggest that you use a std::vector that is passed by (const) reference as needed.