ECNU_OJ_1002

IP Address

Time Limit:1000MS Memory Limit:30000KB

Total Submit:4240 Accepted:1947 Special Judge

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

Mexico and Central America Region 2004

代码

include <stdio.h>
include <malloc.h>
int main(int argc, char **argv)
{
int n = 0;
scanf("%d", &n);

char *ip = (char *)malloc(sizeof(char) * n * 32);

int *ipdot = (int *)malloc(sizeof(int) * n * 4);

int i = 0;

for(i = 0; i < n; i++)
{
scanf("%s",ip + i * 32);
}

for(i = 0; i < n * 32; i++)
ip[i] = ip[i] - '0';

for(i = 0; i < n * 4; i++)
{
ipdot[i] = ip[0] * 128 + ip[1] * 64 + ip[2] * 32 + ip[3] * 16 + ip[4] * 8 + ip[5] * 4 + ip[6] * 2 + ip[7];
ip = ip + 8;
printf("%d",ipdot[i]);
if((i + 1) % 4 == 0)
printf("\n");
else
printf(".");
}

return 0;
}