Homework (Trapec)

import java.util.Scanner;

public class Trapec1 {

    public static void main(String[] args) {

        Scanner scan = new Scanner (System.in);
        double a = scan.nextDouble();
        System.out.println("a:" + a );
        double b = scan.nextDouble();
        System.out.println("b:" + b );
        double h = scan.nextDouble();
        System.out.println("h:" + h );
        double S = (a + b) / 2 *h;
        System.out.println("S=" + S);


    }

}