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Amazon Interview Question for Software Engineer / Developers






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If the question is not clear, given an IP="192.168.0.1", determine a formula to convert the IP string to an integer.

- Artin April 09, 2011 | Flag Reply
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What is meant by this question ?

float IpToD( string ipaddress) which will return the ip adress to some float ?? so are we intending to create String DToIp(float ipaddress) later ??

- M. April 11, 2011 | Flag
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I meant something like this.

ezinearticles.com/?How-to-Convert-an-IP-Address-to-10-Digits-Decimal-Number&id=1716788

- Artin April 14, 2011 | Flag
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If I have understood the question clearly.. here is the code to convert IPv4 to number.

static uint Transform(string input)
        {
            string[] str = input.Split('.');
            uint final = 0;
            uint number = 0;
            for (int i = 0; i < str.Length;i++ )
            {
                number = Convert.ToUInt32(str[i]);
                number = number << ((str.Length - i -1) * 8);
                final = final | number;
                Console.WriteLine();
            }
            return final;
        }

- insigniya April 12, 2011 | Flag Reply
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You are right Insigniya.

- Artin April 14, 2011 | Flag
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or more simply...

int IpToInt(String ip) {
  String[] sIps = ip.split(".");
  
  int result = 0;

  for(int i = sIps.length - 1; i >= 0; i--) {
    int n = Integer.parseInt(sIps[i]);
    result += Math.pow(256, 3-i) + n;
  }

  return result;

}

- Anonymous April 22, 2011 | Flag


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