java 大整数

自己刚学了java 所以先写了一发java大整数，试试手

package ming;
import java.io.*;
import java.util.*;
import java.math.BigInteger;
import java.lang.*;
public class Student {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner cin = new Scanner(System.in);
		int t,i = 1;
		t = cin.nextInt();
		int tot = 0;
		BigInteger a,b,c;
		while(i <= t)
		{
			a = cin.nextBigInteger();
			b = cin.nextBigInteger();
			c = a.add(b);
			System.out.println("Case "+i+":");
			System.out.println(a+" + "+b+" = "+c);
			if(i < t)
				System.out.println("");
			i++;
		}
	}
			     

}