又一次用java水过。。。。。
import java.math.BigInteger;
import java.util.Scanner;
public class Main
{
public static void main(String args[])
{
Scanner cin=new Scanner(System.in);
while(cin.hasNext())
{
int n= cin.nextInt();
int i=0;
while(n-->0){
i++;
BigInteger a=cin.nextBigInteger();
BigInteger b=cin.nextBigInteger();
BigInteger c=a.add(b);
System.out.printf("Case %d:%n%s + %s = %s%n",i,a.toString(),b.toString(),c.toString());
if(n>0) System.out.println();
}
}
}
}