import javax.swing.JOptionPane;
public class triangle1
{
public static void main(String [] args)
        {
String output = "";
    String Rows;
    String Columns;
                
    int rows;
    int columns;
            
Rows = JOptionPane.showInputDialog(null,"Enter number of rows: ");

Columns = JOptionPane.showInputDialog(null,"Enter number of columns: ");
            
rows = Integer.parseInt(Rows);
columns = Integer.parseInt(Columns);
            
if (rows <= 0 || rows >= 101 || columns <= 0 || columns >= 100)
{
JOptionPane.showMessageDialog(null,"Out of Range... ");
System.exit(0);
}
            
if (rows == columns)
{
for (int row = 1;row <= rows;++row)
{
for (int column = 1;column <= row;++column)
{
    output += "*  ";
}
                    output += "\n" + "\n";
}
JOptionPane.showMessageDialog(null,"The output is: " + "\n" + output);
}
else if (rows != columns)
{
JOptionPane.showMessageDialog(null,"Out of Range... ");
System.exit(0);
}

System.exit(0);

}
        

}