prime.java

来自「非常好的JAVA学习资料」· Java 代码 · 共 22 行

import java.io.*;
public class Prime{
   public static void main(String args[]) throws IOException
   {                
      int i;boolean p;
      BufferedReader buf;
      String str;
      buf=new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Input m is:");
      str=buf.readLine();        
      int m=Integer.parseInt(str); 
          p=true;   
          for(i=2;i<m;i++)
             if (m%i==0)
                p=false;
           if (p==true)
               System.out.println(m+" is a prime number.");
           else
               System.out.println(m+" is not a prime number.");   
    }
}