Null in which header file

This doesn't really answer my question. A null character is part of the language definition. There is no standard definition of the null character. Anne S. Anne Sign up or log in Sign up using Google.

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Now live: A fully responsive profile. Table of Contents. Save Article. Improve Article. Like Article. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? If we do not have any address which is to be assigned to the pointer, then it is known as a null pointer.

The dereferencing of the uninitialized pointer variable will show the compile-time error as it does not point any variable. According to the stack memory concept, the local variables of a function are stored in the stack, and if the variable does not contain any value, then it shows the garbage value.

The above program shows some unpredictable results and causes the program to crash. Therefore, we can say that keeping an uninitialized pointer in a program can cause serious harm to the computer.

We can avoid the above situation by using the Null pointer. A null pointer is a pointer pointing to the 0 th memory location, which is a reserved memory and cannot be dereferenced. After creating a pointer variable, we add the condition in which we check whether the value of a pointer is null or not. In the above code, we use the library function, i. As we know, that malloc function allocates the memory; if malloc function is not able to allocate the memory, then it returns the NULL pointer.

Therefore, it is necessary to add the condition which will check whether the value of a pointer is null or not, if the value of a pointer is not null means that the memory is allocated. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services.

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