package clong.jgsu; import java.util.Scanner; public class code_8 { public static void main(String[] args) { /** * 求s=a+aa+aaa+aaaa+aa...a的值，其中a是一个数字。例如2+22+222+2222+22222(此时共有5个数 * 相加)，几个数相加有键盘控制。输出结果的形式如：2+22+222=246； */ Scanner input = new Scanner(System.in); System.out.println("请输入基数"); int cardinalNumber = input.nextInt(); System.out.println("请输入相加的次数"); int count = input.nextInt(); int sum = getSum(cardinalNumber, count); System.out.println("sum = " + sum); } public static int getSum(int cardinal, int count) { int sum = 0; int num = cardinal; for (int i = 1; i <= count; i++) { sum += num; num = num * 10 + cardinal;// 每轮循环过后num都会变大10倍 } return sum; } }