import java.io.*;
/**
* 输入整数n,输出由n行n列星号字符组成的三角形图案
*
* @author user
*
*/
public class Xing2 {
public static void main(String[] args) {
System.out.print("请输入一个正整数:");
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
try {
String s = br.readLine();
while (s != null) {
if (s.equalsIgnoreCase("exit"))
break;
int num = Integer.parseInt(s);
for(int i=1; i