请看这篇blog:http://blog.csdn.net/jcwKyl/article/details/3859155 。
自己的改写的java代码:
public class MixNum { public static void main(String[] args) { InputStream is = System.in; BufferedReader br = new BufferedReader(new InputStreamReader( is)); byte [] bytes = new byte[1024]; int len = 0; while(true){ try { System.out.println("请输入数字n:"); String str = br.readLine(); long n = Long.parseLong(str); if(n<1){ System.out.println("数字n不能小于1,请重新输入"); continue; } long m; for(m=1;;m++){ if(HasOnlyOneAndZero(n*m)) { System.out.println("n="+n+" "+"m="+m+" "+"n*m="+n*m); break; } } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } private static boolean HasOnlyOneAndZero(long i) { while(i>0){ if(i % 10 >= 2) return false; i /= 10; } return true; } }