triangle.java

一个判断是否是等边三角形还是等腰三角形的程序.

import java.lang.String;
import java.io.*;
public class Triangle{
   public static void main(String args[]) throws IOException{
       try{
    	   int A,B,C;
       String str1;
	   String str2;
	   String str3;
	   BufferedReader buf1;
	   buf1=new BufferedReader(new InputStreamReader(System.in));
           System.out.print("Please input A:");
	   str1=buf1.readLine();
	   BufferedReader buf2;
	   buf2=new BufferedReader(new InputStreamReader(System.in));
	   System.out.print("Please input B:");
	   str2=buf2.readLine();
	   BufferedReader buf3;
	   buf3=new BufferedReader(new InputStreamReader(System.in));
	   System.out.print("Please input C:");
	   str3=buf3.readLine();
	   A=Integer.parseInt(str1);
	   B=Integer.parseInt(str2);
	   C=Integer.parseInt(str3);
	   if(A<=0||B<=0||C<=0)
	   {
			System.out.print("不是三角形");
			System.exit(0);
	   }
	   else if(A<B+C&&B<A+C&&C<A+B)
	        {
				if(A!=B&&B!=C&&A!=C)
				{
					System.out.print("任意三角形");
					System.exit(0);
				}
				else if(A==B&&B==C)
				{
					System.out.print("等边三角形");
					System.exit(0);
				}
				else if(A==B||B==C||A==C)
				{
					System.out.print("等腰三角形");
					System.exit(0);
				}
			}
		else
		{
			System.out.print("不是三角形");
			System.exit(0);
		}
}
       catch(NumberFormatException e){
    	  System.out.print("你输入的格式不正确!") ;
       }
}	
}