Octal Fractions java秒 C++

 1 import java.math.*;
 2 import java.util.*;
 3 import java.io.*;
 4 import java.text.*;
 5 
 6 public class Main
 7 {
 8     static int MS=3005;
 9     public static void main(String[] args)
10     {
11         Scanner cin=new Scanner(new BufferedInputStream(System.in));
12         while(cin.hasNext())
13         {
14             String str=cin.next();
15             BigDecimal sum=new BigDecimal(0);
16             BigDecimal tmp=new BigDecimal(1);
17             BigDecimal eight=new BigDecimal(8);
18             for(int i=2;i<str.length();i++)
19             {
20                 tmp=tmp.divide(eight);
21                 sum=sum.add(tmp.multiply(new BigDecimal(str.charAt(i)-‘0‘) ));        
22             }
23             System.out.println(str + " [8] = " + sum.toString() + " [10]");
24         }
25         cin.close();
26     }
27 }

 1 #include <iostream>
 2 #include <string.h>
 3 #include <cstdio>
 4 using namespace std;
 5 const int MS=1001;
 6 
 7 int main()
 8 {
 9     char str[MS],ans[3*MS];
10     int i,j,index,num;
11     while(scanf("%s",str)!=EOF)
12     {
13         int len=strlen(str);
14         index=0;
15         memset(ans,0,sizeof(ans));
16         for(i=len-1;i>1;i--)
17         {
18             num=str[i]-‘0‘;
19             for(j=0;j<index||num;j++)
20             {
21                 num=num*10+(j<index?ans[j]-‘0‘:0);
22                 ans[j]=num/8+‘0‘;
23                 num=num%8;
24             }
25             index=j;
26         }
27         printf("%s [8] = 0.%s [10]\n",str,ans);
28     }
29     return 0;
30 }