Java大数练习

大数阶乘

题目链接：http://acm.nyist.net/JudgeOnline/problem.php?pid=28

 1 import java.io.*;
 2 import java.util.*;
 3 import java.math.*;
 4 //import java.text.*;
 5 
 6 public class Main {
 7 
 8     /**
 9      * @param args
10      */
11     public static void main(String[] args) throws Exception{
12         // TODO Auto-generated method stub
13         Scanner cin = new Scanner (System.in);
14         PrintWriter cout = new PrintWriter(System.out);
15         
16         int n = cin.nextInt();
17         BigInteger ans = BigInteger.ONE;
18         for(int i=1;i<=n;i++)
19             ans = ans.multiply(BigInteger.valueOf(i));
20         cout.println(ans);
21         cout.flush();
22     }
23 
24 }

比较大小

题目链接：http://acm.nyist.net/JudgeOnline/problem.php?pid=73

 1 import java.io.*;
 2 import java.util.*;
 3 import java.math.*;
 4 import java.text.*;
 5 
 6 public class Main {
 7 
 8     /**
 9      * @param args
10      */
11     public static void main(String[] args) {
12         // TODO Auto-generated method stub
13         Scanner cin = new Scanner(System.in);
14         while(true)
15         {
16             BigInteger a = cin.nextBigInteger();
17             BigInteger b = cin.nextBigInteger();
18             if(a.equals(BigInteger.ZERO) && b.equals(BigInteger.ZERO) )
19             {
20                 break;
21             }
22             int flag = a.compareTo(b);
23             if(flag == 0)
24                 System.out.println("a==b");
25             else if(flag == -1)
26                 System.out.println("a<b");
27             else 
28                 System.out.println("a>b");
29         }
30     }
31 
32 }

 

大数加法

题目链接：http://acm.nyist.net/JudgeOnline/problem.php?pid=103

 1 import java.io.*;
 2 import java.util.*;
 3 import java.math.*;
 4 
 5 
 6 public class Main {
 7 
 8     /**
 9      * @param args
10      */
11     public static void main(String[] args) {
12         // TODO Auto-generated method stub
13             Scanner cin = new Scanner(System.in);
14             int T = cin.nextInt();
15             int cas = 1;
16             for(int i=1;i<=T;i++)
17             {
18                 BigInteger a = cin.nextBigInteger();
19                 BigInteger b = cin.nextBigInteger();
20                 BigInteger ans = a.add(b);
21                 
22                 System.out.println("Case "+i+":");
23                 System.out.println(a+" + "+b+" = "+ans);
24             }
25     }
26 
27 }

 

posted @ 2016-03-04 16:34  Helica  阅读(245)  评论(0)  编辑  收藏  举报