What does strtok mean in C?
The C function strtok() is a string tokenization function that takes two arguments: an initial string to be parsed and a const -qualified character delimiter. It returns a pointer to the first character of a token or to a null pointer if there is no token.
What does strtok return if NULL?
strtok() returns a NULL pointer. The token ends with the first character contained in the string pointed to by string2. If such a character is not found, the token ends at the terminating NULL character. Subsequent calls to strtok() will return the NULL pointer.
What does strtok NULL mean?
The first call to strtok must pass the C string to tokenize, and subsequent calls must specify NULL as the first argument, which tells the function to continue tokenizing the string you passed in first. When there are no tokens left to retrieve, strtok returns NULL, meaning that the string has been fully tokenized.
What does char * [] mean in C?
The abbreviation char is used as a reserved keyword in some programming languages, such as C, C++, C#, and Java. It is short for character, which is a data type that holds one character (letter, number, etc.) of data. For example, the value of a char variable could be any one-character value, such as ‘A’, ‘4’, or ‘#’.
When does strtok _ are ( ) return NULL in C?
It returns NULL // when there are no more tokens. char * strtok (char str [], const char *delims); Below is a simple C program to show the use of strtok_r () : strtok can be used to split a string in multiple strings based on some separators. A simple CSV file support might be implemented using this function. CSV files have commas as delimeters.
Is there a reentrant version of strtok in C?
strtok_r() Just like strtok() function in C, strtok_r() does the same task of parsing a string into a sequence of tokens. strtok_r() is a reentrant version of strtok()
Which is an example of a strtok function?
For example, we have a comma separated list of items from a file and we want individual items in an array. // Splits str [] according to given delimiters. // and returns next token. It needs to be called // in a loop to get all tokens.