java 大数

 1 import java.math.BigDecimal;
 2 import java.math.BigInteger;
 3 import java.util.Scanner;
 4 
 5 
 6 public class Main {
 7     public static void main(String[] args) {
 8         BigDecimal n,ans;
 9        
10         Scanner sc=new Scanner(System.in);
11         while(sc.hasNextBigDecimal())
12         {
13             int m;
14             n=sc.nextBigDecimal();
15             m=sc.nextInt();
16             ans=new BigDecimal("1");
17             for(int i=0;i<m;i++)
18                 ans=ans.multiply(n);
19             ans=ans.stripTrailingZeros();
20             String str=ans.toPlainString();
21             if(str.startsWith("0."))
22                 str=str.substring(1);       //以从1开始的子串为新串
23             System.out.println(str);
24             
25                 
26             
27         }
28        
29         
30         
31     }
32 
33 }

 1 import java.math.BigInteger;
 2 import java.util.Scanner;
 3 
 4 
 5 public class Main {
 6     public static void main(String[] args) {
 7         BigInteger ans,n,one,i,zero,m;
 8         Scanner sc=new Scanner(System.in);
 9         n=sc.nextBigInteger();
10         zero=new BigInteger("0");
11         
12         one=new BigInteger("1");
13         while(n.compareTo(zero)>0)
14         {
15             ans=new BigInteger("0");            
16             while(true)
17             {
18                 m=sc.nextBigInteger();
19                 if(m.compareTo(zero)==0)
20                     break;
21                 ans=ans.add(m);
22             }
23             System.out.println(ans);
24             n=n.subtract(one);
25             if(n.compareTo(zero)!=0)
26                 System.out.println("");
27             
28         }
29         
30         
31     }
32 
33 }

 1 //package 大数;
 2 
 3 import java.math.BigInteger;
 4 import java.util.Scanner;
 5 
 6 
 7 public class Main {
 8     
 9     public static void main(String[] args) {
10         BigInteger ans,i,n,one;
11         Scanner sc=new Scanner(System.in);
12         while(sc.hasNextBigInteger())
13         {
14             n=sc.nextBigInteger();
15             one=new BigInteger("1");
16             ans=new BigInteger("1");
17             i=new BigInteger("1");
18             
19             while(i.compareTo(n)<=0)
20             {
21             
22             
23                 ans=ans.multiply(i);
24                 
25                 i=i.add(one);
26                 
27                 
28             }
29             System.out.println(ans);
30             
31         }
32     }
33 
34 }