hdu-1002-Java大数加法

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
  
  

第一次用java做题，没什么特别要说的，就是两个大数的相加求和，用java的BigInteger就行了，输入用cin.nextBigInteger()，输出没啥特别的，加法用a.add(b)，这道题格式控制比较麻烦而已

import java.io.*;
import java.util.*;
import java.math.*;
public class Main
{
	public static void main(String[] args)
	{
		Scanner cin = new Scanner(new BufferedInputStream(System.in)); 
		BigInteger a,b,c;
		int num;
		num=cin.nextInt();
		for(int i=1;i<=num;++i)
		{
			a=cin.nextBigInteger();
			b=cin.nextBigInteger();
			c=(a.add(b));
			System.out.print("Case ");
			System.out.print(i);
			System.out.println(":");
			System.out.print(a);
			System.out.print(" + ");
			System.out.print(b);
			System.out.print(" = ");
			System.out.println(c);
			if(i!=num)
				System.out.println();
		}
	}
}