PROGRAMMING INTERVIEWS

Question: Network ip address is given in string form; read that, parse that from left to right; push into integer. 4 parts of ip, each part can be stored in one byte.

Example:
i/p: 172.12.13.14
o/p: 0xCA0C0D0E (0xCA = 172, 0x0C = 12, 0x0D = 13, 0x0E = 14)

Code:

#include<iostream>
using namespace std;

main()
{
 char in[20];
 int out,i, tmp;

 cout <<"enter ip string: " << endl;
 cin >> in;

 int len = strlen(in);
 int place = 3;
 out = tmp = 0;

 for (i=0; i<len ; i++)
 {
     if(in[i] == '.')
     {
         out += tmp << (8*place--);
         tmp = 0;
         continue;
     }
     tmp = tmp*10 + in[i] - '0';
 }

 out = out + tmp;

 cout << "IP address is: " << hex << out << endl;
}