poj 2105 IP Address

IP Address

Time Limit: 1000MS		Memory Limit: 30000K
Total Submissions: 18951		Accepted: 10939

Description

Suppose you are reading byte streams from any device, representing IP addresses. Your task is to convert a 32 characters long sequence of '1s' and '0s' (bits) to a dotted decimal format. A dotted decimal format for an IP address is form by grouping 8 bits at a time and converting the binary representation to decimal representation. Any 8 bits is a valid part of an IP address. To convert binary numbers to decimal numbers remember that both are positional numerical systems, where the first 8 positions of the binary systems are:

2

⁷

   2

⁶

  2

⁵

  2

⁴

  2

³

   2

²

  2

¹

  2

⁰

128 64  32  16  8   4   2   1 

Input

The input will have a number N (1<=N<=9) in its first line representing the number of streams to convert. N lines will follow.

Output

The output must have N lines with a doted decimal IP address. A dotted decimal IP address is formed by grouping 8 bit at the time and converting the binary representation to decimal representation.

Sample Input

4
00000000000000000000000000000000
00000011100000001111111111111111
11001011100001001110010110000000
01010000000100000000000000000001 

Sample Output

0.0.0.0
3.128.255.255
203.132.229.128
80.16.0.1

Source

México and Central America 2004

 

分析：

进制转换

 #include <cstdio>
 #include<algorithm>
 #include<iostream>
 #include<string>
 #include<cstring>
 #include<vector>
 using namespace std;
 int b[]={,,,,,,,};
 int main(){
     int n;
     string s;
     while(cin>>n){
         while(n--){
             cin>>s;
             int i,j,k=;
             for(i=;i<=;){
                 int sum=;
                 j=;
                 while(j<){
                     if(s[i]=='')
                     sum+=b[i%];
                     i++;
                     j++;
                 }
                 cout<<sum;
                 if(k<){
                     cout<<'.';
                 }
                 else{
                     cout<<endl;
                 }
                 k++;
             }
         }
     }
     return ;
 }