I'm trying to do temperature conversion and I know I need to invoke convertTemp in main, but I just don't know what I'm doing. Can someone take a look at this and help me out?

```
import java.util.Scanner;

public class TemperatureConverter {

  public static void convertTemp() {
       Scanner keyboard = new Scanner(System.in);
       double temperature;
       String temperatureScale = " ";

     if (temperatureScale.equals("f"))
     {    
     // code that converts from Fahrenheit to Celsius 
        temperature = (5/9)*(keyboard.nextDouble() - 32);   
     // and prints the result to the screen  
        System.out.println("The temperature is " + temperature + "degrees celsius");
     }
        //
     else if (temperatureScale.equals("c")) 
     {       
     // code that converts from Celsius to Fahrenheit    
        temperature = 32.0 +(keyboard.nextDouble() * 1.8);
        System.out.println("The temperature is " + temperature + "degrees fahrenheit");
     // and prints the result to the screen 
     } 
     else 
     {    
     // code that outputs a message indicating that an incorrect 
        System.out.println("Error! A valid temperature was not chosen!");   
     // option was selected 
     } 
    }

  public static void main(String[] args) {
     Scanner keyboard = new Scanner(System.in);
     System.out.println("What temeprature number are you trying to find out?"); 
     double keyboardInput = keyboard.nextDouble();

     System.out.println("Type f for Fahrenheit or c for Celsius.");
     String keyboardTempLetter = keyboard.next(); 

   }

  }
 //}

```