Validate IP Address in C++

This article is serving the purpose of validating the correct IP (internet protocol) address by virtue of C++ code programming. The IP address is a 32-bit dot-decimal-notation, broken into four decimal numbers segments ranging from 0 to 255. Furthermore, these numbers are separated by dots consecutively. The IP address serves the purpose of identifying a host machine in the network in a unique manner in order to establish a connection among them.

So, in order to validate the correct IP address input from the user-end, the following algorithm briefs how exactly the code sequence is materialized to identify the correct IP address as follows;

Algorithm

START    Step-1: Input the IP address    Step-2: Spilt the IP into four segments and store in an array    Step-3: Check whether it numeric or not using    Step-4: Traverse the array list using foreach loop    Step-5: Check its range (below 256) and data format    Step-6: Call the validate method in the Main() END

Thence, as per the algorithm the following c++ drafted to validate the IP address, in which couple of essentials functions are being employed to determine the numeric form, range, and splitting the input data respectively;

Example

 Live Demo

#include <iostream> #include <vector> #include <string> using namespace std; // check if the given string is a numeric string or not bool chkNumber(const string& str){    return !str.empty() &&    (str.find_first_not_of("[0123456789]") == std::string::npos); } // Function to split string str using given delimiter vector<string> split(const string& str, char delim){    auto i = 0;    vector<string> list;    auto pos = str.find(delim);    while (pos != string::npos){       list.push_back(str.substr(i, pos - i));       i = ++pos;       pos = str.find(delim, pos);    }    list.push_back(str.substr(i, str.length()));    return list; } // Function to validate an IP address bool validateIP(string ip){    // split the string into tokens    vector<string> slist = split(ip, '.');    // if token size is not equal to four    if (slist.size() != 4)       return false;    for (string str : slist){       // check that string is number, positive, and range       if (!chkNumber(str) || stoi(str) < 0 || stoi(str) > 255)          return false;    }    return true; }    // Validate an IP address in C++ int main(){    cout<<"Enter the IP Address::";    string ip;    cin>>ip;    if (validateIP(ip))       cout <<endl<< "***It is a Valid IP Address***";    else       cout <<endl<< "***Invalid IP Address***";    return 0; }

After the compilation of the above code using a standard c++ editor, the following output is being produced which is duly checking whether the input number 10.10.10.2 is a correct IP address or not as follows;

Output

Enter the IP Address:: 10.10.10.2 ***It is a Valid IP Assress***