打印反斜线

import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            int n = sc.nextInt();
            for(int i = 0; i < n; ++i){
                for(int j = 0; j < n; ++j){
                    if(i == j) System.out.printf("*");
                    else System.out.printf(" ");
                }
                System.out.println();
            }
        }
    }
}