Nyoj 103 addition of large numbers

A simple question. I used to write it in C ++. Today I read some java and wrote it in Java:

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

A, B must be positive.

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 shoshould 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 shoshould 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.

Sample Input

21 2112233445566778899 998877665544332211

Sample output

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

AC code:

 import java.util.*;import java.math.BigInteger;public class Main {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubBigInteger d,dd;    int kk,i;Scanner cin=new Scanner(System.in);kk=cin.nextInt();    for(i=1;i<=kk;++i){d=cin.nextBigInteger();dd=cin.nextBigInteger();System.out.println("Case "+i+":");System.out.println(d+" + "+dd+" = "+d.add(dd));}}}