HDOJ-1002 用JAVA写大数问题[大数加法]

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转载最新推荐文章于 2017-06-05 18:01:40 发布 · 113 阅读

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原文链接：http://www.cnblogs.com/XBWer/archive/2012/06/24/2560488.html

本文介绍了一个经典的编程竞赛题目“A+B Problem II”的详细解析。该题目要求处理两个非常大的整数相加的问题，并使用Java的大整数类BigInteger来解决。文章提供了完整的Java代码示例，展示了如何输入两个大整数、如何进行加法运算以及如何输出结果。

A + B Problem II

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 116352 Accepted Submission(s): 22064

Problem Description

I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B.

Input

The first line of the input contains an integer T(1<=T<=20) which means the number of test cases. Then T lines follow, each line consists of two positive integers, A and B. Notice that the integers are very large, that means you should not process them by using 32-bit integer. You may assume the length of each integer will not exceed 1000.

Output

For each test case, you should output two lines. The first line is "Case #:", # means the number of the test case. The second line is the an equation "A + B = Sum", Sum means the result of A + B. Note there are some spaces int the equation. Output a blank line between two test cases.

Sample Input

   2 1 2 112233445566778899 998877665544332211
  

Sample Output

   Case 1: 1 + 2 = 3 Case 2: 112233445566778899 + 998877665544332211 = 1111111111111111110
  

Author

Ignatius.L

code：

 1 import java.util.*;
 2 import java.math.*;
 3 public class Main
 4 {
 5     public static void main(String []args)
 6     {
 7         int n,i;
 8         BigInteger a,b,c;
 9         Scanner cin=new Scanner(System.in);
10         n=cin.nextInt();
11         for(i=1;i<=n;i++)
12         {
13             if(i!=1)
14                System.out.println();
15                a=cin.nextBigInteger();
16             b=cin.nextBigInteger();
17             c=a.add(b);
18             System.out.println("Case "+i+":");
19             System.out.println(a+" + "+b+" = "+c);            
20         }
21     }
22 }

第一次用java写程序，好多东西都不知道。

转载于:https://www.cnblogs.com/XBWer/archive/2012/06/24/2560488.html