java 大数计算

 1 import java.io.*;
 2 import java.math.BigInteger;
 3 import java.util.*;
 4 public class Main {
 5 
 6     public static void main(String[] args) {
 7         // TODO Auto-generated method stub
 8         Scanner cin=new Scanner (new BufferedInputStream(System.in));
 9         PrintWriter cout=new PrintWriter(System.out);
10         int t;
11         t=cin.nextInt();
12         int eg=1;
13         while(t>0)
14         {
15             BigInteger eight=new BigInteger("8");
16             BigInteger seven=new BigInteger("7");
17             BigInteger one=new BigInteger("1");
18             String inp;
19             inp=cin.next();
20             BigInteger n=new BigInteger(inp);
21             BigInteger ans;
22             BigInteger ans2;
23             ans=n.multiply(n).multiply(eight);
24             ans2=n.multiply(seven);
25             ans=ans.subtract(ans2);
26             ans=ans.add(one);
27             cout.println("Case #"+eg+": "+ans);
28             ++eg;
29             --t;
30             
31         }
32         cout.flush();
33     }
34 
35 }