What does strtok return?

What does strtok return?

strtok() returns a NULL pointer. The token ends with the first character contained in the string pointed to by string2. Subsequent calls to strtok() will return the NULL pointer. If such a character is found, then it is overwritten by a NULL character, which terminates the token.

Why does strtok change the string?

3 Answers. When strtok() finds a token, it changes the character immediately after the token into a \0 , and then returns a pointer to the token. The next time you call it with a NULL argument, it starts looking after the separators that terminated the first token — i.e., after the \0 , and possibly further along.

Is strtok safe in C?

strtok is neither thread safe nor re-entrant because it uses a static buffer while parsing. This means that if a function calls strtok , no function that it calls while it is using strtok can also use strtok , and it cannot be called by any function that is itself using strtok .

How do you make a string in C?

There are several ways to create an array of strings in C. If all the strings are going to be the same length (or at least have the same maximum length), you simply declare a 2-d array of char and assign as necessary: char strs[NUMBER_OF_STRINGS][STRING_LENGTH+1];

Are there strings in C?

There is no string data type in C. The concept of a string in C is in the programmer’s mind – to the compiler (actually not even the compiler, but in reality some library function such as “printf”) a string is simply a series of ASCII bytes in memory beginning at a certain address, and ending when a NULL (value of zero) is encountered.

What is string library in C?

The string class library. Recall that the cstring library consists of functions for working on C-strings. This is a C library. The library called string, which is part of the ” Standard Template Library ” in C++, contains a class called string.

What is string in C programming?

Strings In C Programming Declaration of Strings in C. Declaration of a String in C is exactly the same as in the case of an Array of characters. The Initialization of Strings in C. A string in C could be initialized in different ways. Traversing a String in C.