面向对象的第一次pta作业第四题：判断三角形类型

import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner triangle = new Scanner(System.in);
        double a=0,b=0,c=0;
        a=triangle.nextDouble();
        b=triangle.nextDouble();
        c=triangle.nextDouble();
        if(a<1||a>200||b<1||b>200||c<1||c>200)
        System.out.println("Wrong Format");
        else if((a+b<=c)||(b+c<=a)||(a+c<=b))
            System.out.println("Not a triangle");
        else if((a==b)||(b==c)||(a==c)) {
            if((a==b)&&(b==c))
                System.out.println("Equilateral triangle");
            else if((Math.abs(c*c-a*a-b*b)<=0.00001)||(Math.abs(a*a-c*c-b*b)<=0.00001)||(Math.abs(b*b-a*a-c*c)<=0.00001))
                System.out.println("Isosceles right-angled triangle");
            else 
                System.out.println("Isosceles triangle");
        }
        else if((a*a+b*b==c*c)||(b*b+c*c==a*a)||(a*a+c*c==b*b))
        System.out.println("Right-angled triangle");
        else 
        System.out.println("General triangle");

    }

}