I have a string like this:
char *message = "12#34#56#78#90"
I want to get:
a = "12"
b = "34"
c = "56"
d = "78"
d = "90"
Who can give me a good method?
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1stackoverflow.com/questions/236129/c-how-to-split-a-string shows you how to do this in C++David Heffernan– David Heffernan2010-12-28 11:23:33 +00:00Commented Dec 28, 2010 at 11:23
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4 Answers
Use strtok(). Note that even though that is C++ documentation, the function is also present in C. Take special note to use NULL in subsequent calls to get the next token.
char label = 'a';
char *token = strtok(message, "#");
while (token != NULL) {
printf("%c = \"%s\"\n", label++, token);
token = strtok(NULL, "#");
}
Outputs:
a = "12"
b = "34"
c = "56"
d = "78"
e = "90"
4 Comments
why
Thanks! one more question, if I want to get "1234567890", how to do this?
why
I mean can i get "1234567890" from "12#34#56#78#90" directly?
moinudin
@why This should really be a separate question. SO is a Q&A site, not a discussion forum.
Thomas Matthews
@why: Maintain two pointers into the string. The destination pointer is initialized to the first '#'. The source pointer to the first digit after the first '#'. When the source pointer finds a valid digit, copy the digit to
*destination++. Advance source pointer to next digit, repeat until source pointer hits end of string. Assign '\0' to destination pointer.The strtok function in the standard library does this, you can loop over the string extracting all the tokens.
Comments
strtok_r its like strtok but safer. strtok is deprecated.
Comments
Let's use strsep - no need to depend on a static variable by passing in NULL.
char *string; // It holds "12#34#56"; (cannot be string literal)
char *token = NULL;
while ((token = strsep(&string, "#"))) {
printf("%s\n", token);
}
Comments
