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Program.cs
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Program.cs
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//按照要求检查IP地址。多错几次就知道规则了。
using System;
namespace ValidateIPAddress
{
class Program
{
static void Main(string[] args)
{
string IP = "192.0.0.1";
Console.WriteLine(ValidIPAddress(IP));
}
static string ValidIPAddress(string IP)
{
if (IsIPv4(IP)) return "IPv4";
if (IsIPv6(IP)) return "IPv6";
return "Neither";
}
static bool IsIPv4(string IP)
{
if (!IP.Contains('.')) return false;
var parts = IP.Split('.');
if (parts.Length != 4) return false;
foreach (var part in parts)
{
if (part == "" || (part.Length > 1 && part[0] == '0') || part[0] == '-') return false;
int num;
bool canParse = int.TryParse(part, out num);
if (!canParse) return false;
if (num > 255 || num < 0) return false;
}
return true;
}
static bool IsIPv6(string IP)
{
if (!IP.Contains(':')) return false;
var parts = IP.Split(':');
if (parts.Length != 8) return false;
foreach (var part in parts)
{
if (part == "" || part[0] == '-') return false;
if (part.Length > 4) return false;
for (int i = 0; i < part.Length; i++)
{
if (Char.IsLetter(part[i]) && Char.ToLower(part[i]) >= 'g')
return false;
}
}
return true;
}
}
}