How a c string can be splitted by token '\' using strtok?

Man4ish

How a c string can be splitted by token '\' using strtok?
Example:
Hello\world is one c-string. I need to split it into Hello and world. How this can be implemented? Thanks in advance.

dheerajjoshim

Probably this link may help you.....

STRTOK Link

Regards
Dheeraj Joshi

Man4ish

I know abt this but it does not split it '\' strtok. Even i cannot compile it.

dheerajjoshim

The link was given for your reference not to copy the code from the that page.

Regards
Dheeraj Joshi

whodgson

strtok(s1,s2) returns the next token in s1 using the delimiters specified in s2.
The above link explains this in more detail.
Presumably in your example the' \' is the delimiter.

Man4ish

Following is the error when "\" is used as delemiter for the example given by dhiraj.
check.cpp:8:21: warning: missing terminating " character
check.cpp:8: error: missing terminating " character
check.cpp: In function ‘int main()’:
check.cpp:9: error: expected primary-expression before ‘char’
check.cpp:9: error: expected ‘,’ or ‘;’ before ‘char’
check.cpp:10: error: ‘result’ was not declared in this scope

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 #include <iostream>

#include <string.h>

using namespace std;
 
int main()

{

    char str[] = "now # is the time for all # good men to come to the # aid of their country";

    char delims[] = "\";             //// error because of this

    char *result = NULL;

    result = strtok( str, delims );

    while( result != NULL ) {

    printf( "result is \"%s\"\n", result );

    result = strtok( NULL, delims );

    }

    return 0;

}

~

newb16

You need to escape backslash in character string with backslash like you do it with quote five lines below.

whodgson

newb16 is, I think, pointing out that there is a clash between the delimiters in the string ("#") and the 'char delims []' declaration ("/")

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 char *p=strtok(str," / "); /*This call is required to 

identify the string you want to analyze as the s1 argument.                                                                                                                          

Now loop to analyze the string and print out the tokens

 (words)*/

while (p){

      cout<<p<<'\n'; 

     p= strtok(NULL,"/ ");

}

I haven't compiled or debugged this but this is my understanding of how the function works.

Tassos Souris

going back to the theory every one using C should know, the '\' character is used to excape other characters giving them special meaning.
for example:
'\n' means the new line character
'\t' the tab character
and so on....

since the '\' has a special meaning for C you must escape it to have the character '\'.
So if you need:

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char delims[] = "\\";

whodgson

@Tassos Souris
What you say is generally true but not so in this case as s2 is any delimiter's place holder as part of the strtok() function

Markus

Quote:

Originally Posted by whodgson

@Tassos Souris
What you say is generally true but not so in this case as s2 is any delimiter's place holder as part of the strtok() function

You have misread the OP's question: he wants to use the backslash (\) as a delimiter. However, in C, the backslash is an escape character. Ergo, the line char delims[] = "\"; causes an error because the backslash is escaping the closing quote. Tassos' solution would work.

How a c string can be splitted by token '\' using strtok?

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