gtbh.java

java 编程的一些简单例子

import java.io.*;

public class gtbh
{
	public static void main(String args[])
	{
		int i,j,h=0,c1,c2;
		String s;

		try{
			System.out.print("please input a int shu:");
			BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
			s=br.readLine();
			h=Integer.parseInt(s);
		}catch(IOException e){}
	       if(h==4)
			   System.out.println("4=2+2");
		   if(h==6)
			   System.out.println("6=3+3");
		   else
		   {
			   for(i=3;i<=h/2;i+=2)
			   {
				   c1=i;
				   boolean f1=true;				   
				   				  
					   for(j=3;j<c1;j+=2)
					   {
						   if(c1%j==0)
						   {
							   f1=false;
							   break;
						   }
					   }
			   
						   if(f1)
						   {
							   c2=h-c1;
							   boolean f2=true;
							   for(j=3;j<c2;j+=2)
							   {
								   if(c2%j==0)
								   {
									   f2=false;
									   break;
								   }
							   }
								   if(f1&&f2)
									   System.out.println(h+"="+c1+"+"+c2);
						   }
			   }
		   }
	}
}