Needing help on java methods, the main method has no error but it is the additio

Question

Needing help on java methods, the main method has no error but it is the additional methods of trying to find the x and y coordinates where there is error and I was wondering what I neededd to change to make it correct. Here is my program so far:

import java.util.Scanner;

public class methAng
{
public static void main(String arg[])
{
double r = -1;
Scanner in = new Scanner(System.in);
  
while (r < 0)
{
System.out.println("Enter the magnitude ");
r = in.nextDouble();
}
double ang = -1;
while (ang < 0)
{
System.out.println("Enter the angle");
ang = in.nextDouble();
}
System.out.println("Cartesian coordinates of a vector with polar coordinates r = "+r+" and angle = "+ang+" are equal to:");
}
public static void xvalue(double r,double ang)
{return r*(Math.cos(ang));}
public static void yvalue(double r, double ang)
{return r*(Math.sin(ang));}
}   
  

Explanation / Answer

/*Function have return value then the return type of the function
* should have return type
* The program is modified according to method that returns
* the double type*/
//methAng.java
import java.util.Scanner;
public class methAng
{
   public static void main(String arg[])
   {
      
       System.out.println();
       double r = -1;
       Scanner in = new Scanner(System.in);

       while (r < 0)
       {
           System.out.println("Enter the magnitude ");
           r = in.nextDouble();
       }
       double ang = -1;
       while (ang < 0)
       {
           System.out.println("Enter the angle");
           ang = in.nextDouble();
       }
       System.out.println("Cartesian coordinates of a vector with polar coordinates r = "
       +r+" and angle = "+ang+" are equal to: ("+xvalue(r, ang)+","+yvalue(r, ang)+")");
   }
   //Note: Change the return type of the method xvalue to double
   public static double xvalue(double r,double ang)
   {
      
       return r*(Math.cos(ang));
   }
   //Note: Change the return type of the method yvalue to double
   public static double yvalue(double r, double ang)
   {
       return r*(Math.sin(ang));
   }
}

----------------------------------------   ---------------------------------------- ----------------------------------------

Sample Output:

Enter the magnitude
5
Enter the angle
45
Cartesian coordinates of a vector with polar coordinates r = 5.0 and angle = 45.0 are equal to: (2.626609944088649,4.254517622670592)

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