Thread: hmm for some reason the char.At isnt working

so i did hte code and did exactly what the teacher asked, they had said we needed a char(x,y) but im getting an error, why?

 
import javax.swing.*;
 
public class JMaths
{
	public static void main(String[] args)
	{
 
        String Along;
		String OfWords;
		Double Agent;
		Double Entry;
 
		Along  = JOptionPane.showInputDialog("Give me a number");
		Agent  = Double.parseDouble(Along) * 1.00;
 
		Entry = Math.sin ( Math.toRadians(Agent) );
		JOptionPane.showMessageDialog(null,"Sin of Entry = " + Entry);
		JOptionPane.showMessageDialog(null,"Cosecant of Entry = " + (1/Entry));
 
		Entry = Math.cos ( Math.toRadians(Agent) );
		JOptionPane.showMessageDialog(null,"Cos of Entry = " + Entry);
		JOptionPane.showMessageDialog(null,"Secant of Entry = " + (1/Entry));
 
		Entry = Math.tan ( Math.toRadians(Agent) );
		JOptionPane.showMessageDialog(null,"Tan of Entry = " + Entry);
		JOptionPane.showMessageDialog(null,"Cotangent of Entry = " + (1/Entry));
 
        Entry = Math.pow(Agent,2);
		JOptionPane.showMessageDialog(null,"Entry to the second power = " + Entry);
 
		Entry = Math.sqrt(Agent);
		JOptionPane.showMessageDialog(null,"The square root of the entry = " + Entry);
 
		OfWords = JOptionPane.showInputDialog("Give me a sentence");
		JOptionPane.showMessageDialog(null,"Value at charAt(2) = " + OfWords.charAt(2) );
		JOptionPane.showMessageDialog(null,"Value at charAt(2,5) = " + OfWords.charAt(2,5) );
		JOptionPane.showMessageDialog(null,"Value at substring(2) = " + OfWords.substring(1) );
		JOptionPane.showMessageDialog(null,"Value at substring(2,5) = " + OfWords.substring(1,5) );
		JOptionPane.showMessageDialog(null,"Value at indexOf('2') = " + OfWords.indexOf('2') );
		JOptionPane.showMessageDialog(null,"Value at indexOf('2',5) = " + OfWords.indexOf('2',5) );
    }
}

What error are you getting?

Also, the charAt method only takes an int not two ints.

System.out.println("test".charAt(0));

// Json

so then i might have written down what he wanted the wrong way.

Instead of charAt(x)
and a charAt(x,y)

would it make alot more sense if it was asked
charAt(x)
charAt(y)

Probably, yes

// Json