View Code of Problem 24

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		double a=scanner.nextDouble();
		double b=scanner.nextDouble();
		double c=scanner.nextDouble();
		double p=(a+b+c)/2;
		System.out.printf("%.2f",Math.sqrt(p*(p-a)*(p-b)*(p-c)));
	}
}