I dunno what to do. I get the following error:
operator cannot be applied to java.lang.strin g int

Code:
public void actionPerformed(ActionEvent e)
		{
			

		
		if(e.getActionCommand().equals("Celsius"))
		{
		
		
		C = JOptionPane.showInputDialog("Enter temperature here: ");
		
		a1 =Double.parseDouble(C);
			
		Can = (C *9/5) +
...