C# program to reverse each word of a sentence separately ?

Question

1.00/5 (1 vote)

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a C# program to reverses each word in a sentence except these punctuation marks (? ! . ,)

example: (input) this is john, who are you?

(output) sith si nhon, ohw era uoy?
_______________________________________...
here's my code which reverses punctuation marks too and removes the space character in the output.. :,(

C#

string str = Console.ReadLine(); 
string strrev = ""; 

foreach (var word in str.Split(' ')) 
{ 
   string temp = ""; 
   foreach (var ch in word.ToCharArray()) 
   { 
      temp = ch + temp; 
   } 
   strrev = strrev + temp + ""; 
} 
Console.WriteLine(strrev);
Console.ReadLine();

Posted 12-Apr-14 7:30am

Alexis i

Updated 12-Apr-14 9:14am

Nelek

v3

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Comments

PIEBALDconsult 12-Apr-14 13:43pm

Split is too limiting, it's not very useful. Try a RegularExpression.
Also, the ToCharArray is needless, you can foreach the string characters directly.

[no name] 12-Apr-14 13:47pm

And nowhere are you checking to see if the char is a punctuation mark.

2 solutions

Solution 1

You are almost at target ;)

Have a look here: How to: Split Strings (C# Programming Guide)[^]
As you see, Split() function can accept many delimiters:

C#

char[] delimiterChars = { ' ', ',', '.', ':', '\t', '?', '!', '@', '#'};

Tip: after second forach loop, replace this line:

C#

strrev = strrev + temp + "";

with:

C#

strrev = strrev + temp + " ";

That's all!

Posted 12-Apr-14 8:03am

Maciej Los

Comments

CHill60 12-Apr-14 14:23pm

4'd only (sorry!) - when I tried this the punctuation was removed.

Maciej Los 12-Apr-14 14:25pm

Not to worry...
Thank you, Chill ;)

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CHill60 · Accepted Answer · 2014-04-12T08:27:00

Further to Solution 1 (and shamelessly stealing Maciej Los' delimiters) here's how I went about it

C#

string str = "this is john, who are you?";
string strrev = "";
char[] punctuation = new char[] { ' ', ',', '.', ':', '\t', '?', '!', '@', '#' };   // note the space!

// convert the input to char[]
char[] inputAsChars = str.ToCharArray();

// step through the char[] looking for punctuation and spaces
string temp = "";
foreach (char c in inputAsChars)
{
    if (punctuation.Contains(c))
    {
        //found a word separator so reverse what we have so far
        char[] tx = temp.ToCharArray();
        Array.Reverse(tx);
        temp = new string(tx);
        strrev += temp + c;    // make sure we add on the separator
        temp = "";
    }
    else
        temp += c; //otherwise add the char to the end of our temporary word
}

System.Diagnostics.Debug.Print(strrev);

Produced this output

siht si nhoj, ohw era uoy?