题解 | #计算三角形的周长和面积#

import java.util.Scanner;
public class Main{
    public static void main(String[]args){
        Scanner in = new Scanner(System.in);
        String input = in.nextLine();
        String []numList = input.split(" ");
        int []num = new int[numList.length];
        for(int j =0;j<numList.length;j++)
        {
            num[j]=Integer.parseInt(numList[j]);
        }
        System.out.print("circumference="+String.format("%.2f",circumference(num[0],num[1],num[2]))+" ");
        System.out.print("area="+String.format("%.2f",area(num[0],num[1],num[2])));
    }
    public static double circumference(int a,int b,int c)
    {
        return (double)a+b+c;
    }
    public static  double area(int a, int b ,int c)
    {
        double p = (double)(a + b + c)/2;
        return Math.sqrt(p*(p-a)*(p-b)*(p-c));

    }
}