How Can I Insert Zeros in the Middle of a String of IP? C/C++
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Thread: How Can I Insert Zeros in the Middle of a String of IP? C/C++

  1. #1
    Join Date
    Sep 2008
    Posts
    119

    How Can I Insert Zeros in the Middle of a String of IP? C/C++

    I wrote a piece of code that does the following:

    1. Get IP from user in this format xx.xx.xx.xx
    2. Fill zeros at the left of each segment if user did not enter 3 digits on the set, e.g.
    0xx.00x.xxx.0xx

    Input is: 22.3.120.32
    Output should be: 022.003.120.032

    Here is my code, it works but not perfectly. When user inserts 111.33.66.3, nothing happens, it works when the first segment is not 3 numbers, there are many other flaws too.

    Here is my code

    Code:
    #include <iostream>
    #include<string>
    using namespace std;
     
    const int MAX_IP_SIZE = 15;
    const int MAX_IP_DIGIT = 3;
     
    int main ()
    {
            string IP;
            int numOfZerosToFill = 0;
            int tempDigitCount = 0;
            int IPCurrentPointer = 0;
     
            cout<<"ENTER IP: ";
            cin>>IP;
     
            while (IPCurrentPointer < (int)IP.length())
            {
                    char dot = IP.at(IPCurrentPointer);
                 
                    if(dot == '.')
                    {
                            numOfZerosToFill = MAX_IP_DIGIT - tempDigitCount;
                          
                            if( numOfZerosToFill == 1 || numOfZerosToFill == 2)
                            {
                                    int spotForFillingZeros = IPCurrentPointer - tempDigitCount;
                                    IP.insert(spotForFillingZeros, numOfZerosToFill, '0');
                                    IPCurrentPointer += numOfZerosToFill;
                                   
                                    tempDigitCount = 0;
                            }
                    }
                    else
                            tempDigitCount++;
     
                    IPCurrentPointer++;
            }
     
            numOfZerosToFill = MAX_IP_DIGIT - tempDigitCount;
            if( numOfZerosToFill == 1 || numOfZerosToFill == 2)
            {
                    int spotForFillingZeros = IPCurrentPointer - tempDigitCount;
                    IP.insert(spotForFillingZeros, numOfZerosToFill, '0');
                    IPCurrentPointer += numOfZerosToFill;
            }
     
            cout<<IP<<"******"<<endl;
            system("pause");
            return 0;
    }
    Do you have a better algorithm? Please note that i will receive the IP from a parameter ready & then pass it to a function that inserts zeros on the front if possible. The piece of code above is a sample out of a bigger source code.


    Thanks

  2. #2
    Join Date
    Sep 2004
    Location
    Holland (land of the dope)
    Posts
    4,123

    Re: How Can I Insert Zeros in the Middle of a String of IP? C/C++

    Use sprintf to format.

    Code:
    sprintf (strResult, "&#37;03s", strIpSegment);
    if IpSegment is '12', strResult will be '012'.

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