c# Reversing words in a string using single loop without using reverse function and stack

Question

I have tried writing the logic for reversing each word in a string with single loop but I didn't get it to work. Can you please provide the logic to reverse every word in a string using single loop and without using reverse function.

Input:

Welcome to the world

Output:

emocleW ot eht dlrow

My Logic with two loops:

class Program
    {
        static void Main(string[] args)
        {
            string input = string.Empty;
            input = Console.ReadLine();
            string[] strarr=input.Split(' ');
            StringBuilder sb = new StringBuilder();
            foreach (string str in strarr)
            {
                sb.Append(fnReverse(str));
                sb.Append(' ');
            }
            Console.WriteLine(sb);
            Console.Read();
        }
        public static string fnReverse(string str)
        {
            string result = string.Empty;
            for (int i = str.Length-1; i >= 0; i--)
                result += str[i];
            return result;
        }
    }

Why don't you simply pass input string to your function fnReverse it should work — Ankit
– Ankit, Commented Sep 10, 2017 at 18:04

Deolus · Accepted Answer · 2017-09-10 18:24:28Z

2

    string strIn = "Welcome to the world";
    string strTmp = "";
    string strOut = "";

    for (int i=strIn.Length-1; i>-1; i--)
    {
        if (strIn[i] == ' ')
        {
            strOut = strTmp + " " + strOut;
            strTmp = "";
        }
        else
        {
            strTmp += strIn[i];
        }   
    }
    strOut = strTmp + " " + strOut;

Gives the result "emocleW ot eht dlrow"

answered Sep 10, 2017 at 18:24

Deolus

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3 Comments

Ashkan Mobayen Khiabani Over a year ago

this is just same as my answer

YowE3K Over a year ago

@AshkanMobayenKhiabani It does appear to be the same as yours, although this appears to have been posted before yours was edited to use this method. I would suggest that you both arrived at the same answer independently.

Deolus Over a year ago

@AshkanMobayenKhiabani Yes sorry, it was the last thing I posted before I logged off and then saw that you had edited yours to be the same. Great minds think alike and all that..

Ashkan Mobayen Khiabani · Accepted Answer · 2017-09-10 18:28:52Z

1

 string input = Console.ReadLine();
            string result = "";
            string tmp = "";
            for (int i = input.Length - 1; i >= 0; i--)
            {
                if (input[i] == ' ')
                {
                    result =  tmp + " " + result;
                    tmp = "";
                }
                else
                    tmp += input[i];
            }
            result = tmp + " " + result;
            Console.WriteLine(result);

Here is the DEMO

edited Sep 10, 2017 at 18:28

answered Sep 10, 2017 at 18:01

Ashkan Mobayen Khiabani

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5 Comments

Anand kumar Over a year ago

Thanks for your response but if i consider over all program i should be using only one loop but in my code i have used 2 loops.

Ashkan Mobayen Khiabani Over a year ago

can you tell me what are these two loops? I don't get it. there is only one loop for reversing the string

Guilherme Over a year ago

@AshkanMobayenKhiabani I think he is talking about the foreach that loops each word.

Ashkan Mobayen Khiabani Over a year ago

you can not have it with single loop. you may hide the loop for example using linq query but still it will be there

Ashkan Mobayen Khiabani Over a year ago

@Anandkumar now I get what you mean. please have a look at my edited answer

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