/*
if ipAddress consists of 4 numbers
and
if each ipAddress number has no leading zeroes
and
if each ipAddress number is in range 0 - 255

then ipAddress is valid

else ipAddress is invalid
*/

string ip_addr_1 = "94.88.1.16";
string ip_addr_2 = "255.0.0.255";
string ip_addr_3 = "555..0.555";
string ip_addr_4 = "255.015.0.255";
string ip_addr_5 = "16.f.0.16";
string[] ip_addrs = {ip_addr_1, ip_addr_2, ip_addr_3, ip_addr_4, ip_addr_5};

bool validate_ip(string ipv4) {
    bool valid = false;
    bool lenght = false;
    bool zeroes = false;
    bool range = false;
    string[] ip_segs = ipv4.Split('.');
    foreach (string segm in ip_segs){
        lenght = segm.Length>0 && segm.Length<=3;
        if(lenght){
            Int16 segment;
            valid = Int16.TryParse(segm, out segment);
            if(!valid){
                Console.Write($"({segm}) is a invalid ipv4 segment! ");
                return false;
            } else {
                if(segm.StartsWith("0") && segm.Length > 1 || segment < 0 || segment > 255){
                    Console.Write($"({segm}) is a invalid ipv4 range! ");
                    return false;
                } else {
                    range = true;
                    zeroes = true;
                }
            }
        } else {
            Console.Write($"({segm}) is a invalid ipv4 lenght! ");
            return false;
        }
    }
    if(valid && zeroes && lenght && range) {
        return true;
    } else {
        return false;
    }
}

foreach (string ip_addr in ip_addrs){
    if(validate_ip(ip_addr)){
        Console.WriteLine($"{ip_addr} is a valid IP");
    } else {
        Console.WriteLine($"{ip_addr} is not a valid IP");
    }
}