Java 代码

/**4 MDKJ
“Never let the fear of striking out keep you from playing the game.”
    — Babe Ruth
*/
import java.util.Scanner;

public class Main
{
    static final double PI = 3.14159;

    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);
        double a = cin.nextDouble();
        double b = cin.nextDouble();
        double c = cin.nextDouble();

        System.out.println("TRIANGULO: " + String.format("%.3f", a * c /2.0));
        System.out.println("CIRCULO: " + String.format("%.3f", c * c * PI));
        System.out.println("TRAPEZIO: " + String.format("%.3f", ((a + b) * c / 2.0)));
        System.out.println("QUADRADO: " + String.format("%.3f", b * b));
        System.out.println("RETANGULO: " + String.format("%.3f", a * b));
    }
}