java-第九章-编写程序,打印如图案,要求图案的行数由用户输入.

package 本章总结;

import java.util.Scanner;

public class A01 {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner in = new Scanner (System.in);
System.out.println("请输入打印行数:");
int rows =in.nextInt();
for (int i = 1; i <=rows; i++) {
for (int j = 1; j <=i; j++) {
System.out.print(j+" ");
}
System.out.println();
}
}
}