Java Infinite Loop in Java Error?

[aartiyadav]

Hello Everyone, I am new in this community and new to Java and am attempting to write code that takes the number of sides of a polygon and the length of each side as input and gives the area of the polygon as output. The JRE I am using says that my code will not run, possibly because of an endless loop. I do not see any errors in my code, but I have an untrained eye so any help would be greatly appreciated. I'm using the online compiler on https://www.interviewbit.com/online-java-compiler/ Below is my code.

import java.util.Scanner;

public class Exercise04_05{
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        System.out.print("Enter the number of sides: ");
        double num = input.nextInt();

        System.out.println("Enter the side: ");
        double side = input.nextInt();

        double area = (num*side*side) / (4 * Math.tan(Math.PI / num));

        System.out.print("the area of the polygon is: " + area);
    }
}

 

[Deleted member 2829]

That looks totally straightforward, and there's certainly no endless loop here.

Actually when I paste this into your online compiler and click Run, it doesn't even compile, because the class Exercise04_05 should be declared in Exercise04_05.java. I see no way to define a file name here.

But the 'normal' Java compiler has absolutely no problem with this program, see:

D:\Temp>java -version
java version "17.0.1" 2021-10-19 LTS
Java(TM) SE Runtime Environment (build 17.0.1+12-LTS-39)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.1+12-LTS-39, mixed mode, sharing)

D:\Temp>javac Exercise04_05.java

D:\Temp>java -cp . Exercise04_05
Enter the number of sides: 4
Enter the side:
3
the area of the polygon is: 9.000000000000002
D:\Temp>