(数组的应用二：高精度运算4.2.1)POJ 1504 Adding Reversed Numbers(将一个数取反)
package com.njupt.acm;import java.math.BigInteger;import java.util.Scanner;public class POJ_1504 {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);int t = scanner.nextInt();while(t>0){String str1 = scanner.next();String str2 = scanner.next();//StringBuilder的reverse()方法能将一个字符串取反StringBuilder sb1 = new StringBuilder(str1);StringBuilder sb2 = new StringBuilder(str2);//Integer.parseInt(str)..能去掉前置的无效0int add1 = Integer.parseInt(sb1.reverse().toString()); int add2 = Integer.parseInt(sb2.reverse().toString()); int result = add1 + add2;String str3 = String.valueOf(result);StringBuilder sb3 = new StringBuilder(str3);System.out.println(Integer.parseInt(sb3.reverse().toString()));t--;}}}