Java 14 how to put numbers in a GUI

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bob bob
bob bob 2020-10-21
hallo i am using eclips and whant to put numbers into a GUI but it wont let me.
this is my code (it keeps telling me to change the double a and b into a string but then i cant do maths maby it is to do with the JOptionPane.showInputDialog ) :
import javax.swing.JOptionPane;
public class test4 {
public static void main(String[] args) {
double c;
JOptionPane.showMessageDialog( null, "This will find out the hypotenuse of your triangle.");
double a = JOptionPane.showInputDialog("Enter Side A:");
double b = JOptionPane.showInputDialog("Enter Side B:");
c = Math.sqrt((a*a)+(b*b));
JOptionPane.showMessageDialog( null, "hypotenus:"+c);
}
}

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