杭电ACM 1002题

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

public class Main {

public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int m=n;
String result=null;
while (n-->0){
String x=sc.next();
String y=sc.next();
BigInteger b1=new BigInteger(x);
BigInteger b2=new BigInteger(y);
result=b1.add(b2).toString();
System.out.println("Case"+" "+(m-n)+":");
System.out.println(b1+" + "+b2+" = "+result);
if(n!=0){
System.out.println("");
}
}
}
}