package com.smallprogram; import java.util.Scanner; /** * @date:2018-4-19 * @author x_san * @describe: 输入数字a和b(只针对a为一位数字,b为的次数),计算sum=a+aa+aaa+aaaa+... * @describe: 例如:a=2,b=5,sum=2+22+222+2222+22222 */ public class AN { public static void main(String[] args) { Scanner input = new Scanner(System.in); int sum = 0, temp = 0, a=0, b=0; System.out.println("请输入a:"); a = input.nextInt(); System.out.println("请输入b:"); b = input.nextInt(); StringBuffer buffer = new StringBuffer(); for(int i=0; i < b; i++) { temp += a * Math.pow(10, i); sum += temp; buffer.append(temp + "+"); } String s = buffer.substring(0, buffer.length()-1); System.out.println("sum=" + s + "=" + sum); } }
输入数字a和b,计算sum=a+aa+aaa+aaaa+...
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