三角形用嵌套for循环输出
package test;
import java.util.Scanner;
public class Trigon {
public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
System.out.println("");
int n=scan.nextInt();
for(int i=0;i<n;i++){
for(int j=i;j<n;j++ ){
System.out.print(" ");
}
for(int k=i;k<i*2+1;k++){
System.out.print("* ");
}
System.out.println();
}
}
}