C#•3y ago

String Reversal

Geeksforgeeks' solution checks for str==null (which I presume is in case someone calls reverse()). My questions are as follows: 1. How many different ways can the actual terminating condition be called? I used (str == "") but it seems (str.Length <= 1) or (str.Length==0) can also be used. What are some others? What are the advantages/disadvantages of each? 2. Why doesn't Console.Write(str) where str is null call up an unhandled exception?

2 Replies

Pobiega•3y ago

null converts to "" when printed there are many ways to check for an empty string. My personal favorite is string.IsNullOrEmpty(yourStringVariable)

Groophy•3y ago

    public static string Reverse(string str)
    {
        return String.Concat((string.IsNullOrEmpty(str) ? "" : str).ToCharArray().Reverse());
    }

    public static string Reverse(string str)
    {
        return String.Concat((string.IsNullOrEmpty(str) ? "" : str).ToCharArray().Reverse());
    }

better method

public static string Reverse(string str) => return String.Concat((string.IsNullOrEmpty(str) ? "" : str).ToCharArray().Reverse());

public static string Reverse(string str) => return String.Concat((string.IsNullOrEmpty(str) ? "" : str).ToCharArray().Reverse());

don't give error when null

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Programming

String Reversal

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