string problem in C#

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this is my code,

C#

string text = System.IO.File.ReadAllText(@"D:\Compiler\test.txt");
            Console.WriteLine(text);



            char[] array = ar.ToCharArray();
            char[] asa;
            for (int i = 0; i <= array.Length - 1; i++)
            {
                        if (array[i] == ' ')
                        {
                            

                        }


                  else
                  {
                   letter =array[i]; 
                   Console.Write(letter);
                  }

                }

in this code text read character by character. i want to do this if a space will come then word is complete and each word into it's own string in an array. for example:
void main void,,,,,
output:
exampleArray[0] = void
exampleArray[1] = main
exampleArray[2] = void
how to do this please help.............

Posted 19-Mar-13 21:34pm

Arsalaan Ahmed

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Matt T Heffron · Answer 1 · 2013-03-20T07:16:00

Since your input file suggested that you are writing a compiler (likely for a class), splitting the input based on spaces may come back to cause trouble. There are cases where spaces are significant. For example, in string and character constants.
In the long run, you would probably do better to implement a simple state machine to take the input text as an IEnumerable<char> and return a sequence of objects representing the "token". I.e., identifier, integer/char/string/float/double const, various punctuation symbols (single and multiple character...). This is the lexical analysis of your input. Further along in the processing you can differentiate between reserved-words and user-defined ids.

Steve44 · Answer 2 · 2013-03-19T21:38:00

Solution 1

There is an easier way:

C#

string[] parts = ar.Split(' ');

The result is an array of string, split at the spaces.

For the additional requirement if splitting at ( and ) here the proposal:

First, add a "gremlin" at the end, e.g. '@', this should not be one of your watched symbols. After split at spaces you get

[0]=void
[1]=main(void)@

In this case you repeat on every string and split using first '(', iterate over the parts adding them to a new collection and adding string "(" between them. Now you have

[0]=void
[1]=main
[2]=(
[3]=void)@

After that you iterate over all parts splitting at ')', adding them to a new collection and adding string ")" between them.
Now you have

[0]=void
[1]=main
[2]=(
[3]=void
[4]=)
[5]=@

After you are done remove the 'gremlin', either from the end of the last string if it has more than 2 characters, or the whole last string.
Then you get:

[0]=void
[1]=main
[2]=(
[3]=void
[4]=)

I think you get the picture.

Posted 19-Mar-13 21:38pm

Steve44

Updated 19-Mar-13 22:53pm

v2

Comments

Arsalaan Ahmed 20-Mar-13 4:29am

for (int i = 0; i <= array.Length - 1; i++)
{
if (array[i] == ' ')
{
string cas = new string(array);
Console.WriteLine(cas);
}
else
if (array[i] == '(' || array[i] == ')')
{
Console.Write(array[i]);
}
else
{
letter =array[i];
// Console.Write(letter);

}
this is a code in this code...
void main(void)
str[0]=void
str[1]=main
str[2]=(
str[3]=void
str[4]=)
in this situation how to do this,,,,,

Steve44 20-Mar-13 4:42am

First, add a "gremlin" at the end, e.g. '@', this should not be one of your watched symbols. After split at spaces you get [0]=void [1]=main(void)@ In this case you repeat on every string and split using first '(', iterate over the parts adding them to a new collection and adding string "(" between them. Now you have [0]=void [1]=main [2]=( [3]=void)@ After that you iterate over all parts splitting at ')', adding them to a new collection and adding string ")" between them. Now you have [0]=void [1]=main [2]=( [3]=void [4]=) [5]=@ After you are done remove the 'gremlin', either from the end of the last string if it has more than 2 characters, or the whole last string. I think you get the picture.
Adding to the solution so formatting works.

Arsalaan Ahmed 20-Mar-13 5:00am

yes steve,,

Arsalaan Ahmed 20-Mar-13 5:02am

how to do this can u give me code,,

Prasad Khandekar · Answer 3 · 2013-03-19T21:40:00

Solution 2

Hello Arsalan,

How about doing this as

C#

string[] words = text.Split(' ');

Regards,

Posted 19-Mar-13 21:40pm

Prasad Khandekar

RajeshRaushan · Answer 4 · 2013-03-22T05:05:00

Hi Ahmed,

As you have started with opening a file so I believe you want to read that filestream character by character and there you want to get all the strings. I am just modifying your code a little bit if it helps you.

C#

string filePath = @"D:\Compiler\test.txt";
FileStream fs = System.IO.File.OpenRead(filePath);

string delimiters = " \t\n,.()[]";
List<string> allTokens = new List<string>();
StringBuilder sb = new StringBuilder();
            
while (fs.CanRead)
{
    char c = Convert.ToChar(fs.ReadByte());
    if (delimiters.IndexOf(c) >= 0) // character is delimiter
    {
        allTokens.Add(sb.ToString());
        sb.Clear();
    }
    else
    {
        sb.Append(c);
        Console.Write(c);
    }
}

string problem in C#

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