编辑代码

import java.math.BigInteger;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        BigInteger a;
        BigInteger b;
        Scanner sc = new Scanner(System.in);
        int T=0;
        T=sc.nextInt();
        for (int i = 1; i <= T; i++) {
             a=sc.nextBigInteger();
             b=sc.nextBigInteger();
             if(i==T) {
                 System.out.println("Case " + (i) + ":\r\n" + a + " + " + b + " = " + a.add(b));
             }
             else {
                 System.out.println("Case " + (i) + ":\r\n" + a + " + " + b + " = " + a.add(b)+"\r\n");
             }
        }
        sc.close();
    }
}