package com.mc.Demo;

import java.util.Scanner;

public class TestDemo {

    public static void main(String[] args) {
        // new TestDemo();
        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入三角形的三邊:");
        int a = sc.nextInt();
        int b = sc.nextInt();
        int
 
 c = sc.nextInt();
        // 判斷是否三角形
        if (a + b >= c && a + c >= b && b + c >= a) {
            // 判斷三角形型別
            if (a == b && b == c) {
                System.out.println("這是等邊三角形");
            } else if (a == b || a == c || b == c) {
                System.out
 
.println("這是等腰三角形");
            } else if (a * a == b * b + c * c || b * b == a * a + c * c || c * c == a * a + b * b) {
                System.out.println("這是直角三角形");
            } else if (a * a + b * b > c * c || a * a + c * c > b * b || b * b + c * c > a * a) {
                System.out
 
.println("這是銳角三角形");
            } else if (a * a + b * b < c * c || a * a + c * c < b * b || b * b + c * c < a * a) {
                System.out.println("這是鈍角三角形");
            }
        } else {
            System.out.println("這不是三角形");
        }
    }
}