in.java

计算方法课

import java.io.*;
public class in{

  public static void main(String args[])
  throws IOException
  {
    char c;
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("enter number(3 to 8),'q' to quit");
    do {
      c = (char) br.read();
      //System.out.println(c);
    }
    while (c != 'q');
    System.out.print(c);
  }

}