[编程入门]宏定义练习之三角形面积-题解（Java代码）

import java.util.Scanner;

public class Test05 {
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       double a = scan.nextDouble();
       double b = scan.nextDouble();
       double c = scan.nextDouble();
       double result = getArea(a,b,c);
       System.out.printf("%.3f",result);

   }
   public static double getPerimeter(double a, double b,double c) {
       return (a + b + c) / 2;
   }

   public static double getArea(double a, double b,double c) {
       double result = getPerimeter(a,b,c);
       return Math.sqrt(result*(result-a)*(result-b)*(result-c));
   }
}