杭电1002用Java解决大数、

 

import java.math.BigDecimal;
import java.util.Scanner;

public class Main{
 public static void main(String[] args) {
  String s1;
  String s2;
  String sum;
  Scanner s = new Scanner(System.in);
  int n = s.nextInt();
  int m = n;
  int i = 0;
  for(;n>0;n--){
   i++;
   s1 = s.next();
   s2 = s.next();
   BigDecimal b1 = new BigDecimal(s1);
   BigDecimal b2 = new BigDecimal(s2);
   sum = b1.add(b2).toString();
   if(i!=m){
    System.out.println("Case "+i+":");
    System.out.println(s1+" + "+s2+" = "+sum);
    System.out.println();
   }else{
    System.out.println("Case "+i+":");
    System.out.println(s1+" + "+s2+" = "+sum);
   }
   
  }
 }
}