HDU 1002（Java）

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
int T;
Scanner in=new Scanner(System.in);
T=in.nextInt();
int cas=1;
while(T-->0)
{
BigInteger a,b,c;
a=in.nextBigInteger();
b=in.nextBigInteger();
c=a.add(b);
System.out.println("Case "+(cas++)+":");
System.out.println(a+" + "+b+" = "+c);
if(T!=0)
System.out.println("");
}
}
}