package com.yj;
import java.util.Scanner;
public class Triangle {
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
System.out.println("请输入一个整数;");
int n=s.nextInt();
for (int i = 1; i <= n; i++) {// 控制行
for (int j = 1; j <= n - i; j++) {// 输出空格
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
if (i == 1 || i == n) {
System.out.print("*");
} else {
if (k == 1 || k == 2 * i - 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
}
System.out.println();
}
}
}