import java.util.Scanner; class ScannerTest{ public static void main( String[] args){ Scanner scanner=new Scanner(System.in); System.out.print("请输入一个数"); int a=scanner.nextInt(); System.out.printf("%d的平方是%d\n",a,a*a); } }
原文：https://www.cnblogs.com/Lee-yl/p/9053130.html