My program seg faults and i\'m not sure why. Can you help me generate a program

Question

My program seg faults and i'm not sure why. Can you help me generate a program that fufills the purpose below without seg faulting?

//Purpose: display the greeting message at the center of the bottom line of the computer screen.
// step 1: get the total number of lines and columns of the terminal window
//   step 2: clear the terminal window
//   step 3: diplay the greeting message at the center of the bottom line of the termial window

#include <iostream>
#include <cstdlib>
#include <stdlib.h>

using namespace std;

int main()
{
int lines = atoi(getenv("LINES"));
int columns = atoi(getenv("COLUMNS"));
string greetings = "Thank you to make the screen so clean!";
  
if (system("CLS"))//for windows
   {
       system("clear");//for linux
}
  
   for (int n=1; n < lines; n++)
   {
       cout << endl;
   }
  
for (int m=0; m < (columns - greetings.length())/2 ; m++)
   {
       cout << " ";
}
  
   cout << "Thank you to make the screen so clean!" << endl;
return 0;
}

Explanation / Answer

#include <iostream>

#include <cstdlib>

#include <stdlib.h>

#include <sys/ioctl.h>

using namespace std;

int main()

{

struct winsize w;

ioctl(0, TIOCGWINSZ, &w);

int lines = w.ws_row;

int columns = w.ws_col;

string greetings = "Thank you to make the screen so clean!";

if (system("CLS"))//for windows

{

system("clear");//for linux

}

for (int n=1; n < lines; n++)

{

cout << endl;

}

for (int m=0; m < (columns - greetings.length())/2 ; m++)

{

cout << " ";

}

cout << "Thank you to make the screen so clean!" << endl;

return 0;

}

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