Reverse order of string, but keep numbers intact

Question

I have a string like this:

1.1.168.192

I need to convert it to this, with the numbers intact but the order reversed:

192.168.1.1

This seems like an easy question, but I cant figure it out. I'm trying something within a for loop right now but I don't know how to make it work.

A naive solution: `string.Join(".", input.Split('.').Reverse())` — Lasse V. Karlsen, Feb 02 '22 at 17:04
@zcoop98 That's about reversing all the characters in a string. The OP just wants to reverse the order of the numbers between the periods while keeping the numbers the same. — juharr, Feb 02 '22 at 17:06
Related, but not a duplicate: [Best way to reverse a string in c#](https://stackoverflow.com/q/228038) — zcoop98, Feb 02 '22 at 17:10
@LasseV.Karlsen thank you so much it saved my life!! It worked. Pure solution. I was trying some dumb for loops. — midoriyakuzan, Feb 02 '22 at 17:15

score 1 · Accepted Answer · answered Feb 02 '22 at 17:13

This could help:

string[] splitted = "1.1.168.192".Split('.');
Array.Reverse(splitted);
string reversed = string.Join(".", splitted);

The idea is you can split things by using a char and it creates an array, then reverse it, and then join them by using a char again it will become string again.

score 0 · Answer 2 · answered Feb 02 '22 at 17:16

you could split your your string and reverse this array and join it together like this:

string reverseIP(string ip) { // ip = "1.1.168.192"
    string[] ipParts = ip.split('.'); // ["1", "1", "168", "192"]
    Array.Reverse(ipParts);
    
    return String.Join(".", ipParts);
}

Reverse order of string, but keep numbers intact

2 Answers2