هرمش - محرر الكود

var n;

do 
{
    write("Enter number of lines: ");
    n = read();
}
while (n<=0 || isNaN(n));

for (var i=1; i<=n; i++)
{
    for (var j=1; j<=n*2; j++)
    {
		if ((i%2==1 && j%2==1) || (i%2==0 && j%2==0))
		{
			write("1");
		}
		else
		{
			write("0");
		}
    }
	
    write("\n");
}