What are null pointers in C and how do they work?

What are null pointers in C and how do they work?

Null pointers in C are pointers that do not point to any valid memory location. They are often used to indicate that a pointer is not initialized.

How do I check if a pointer is null?

You can check if a pointer is null by using an if statement, like this: if (ptr == NULL) { /* pointer is null */ }.

What happens if I try to dereference a null pointer?

Dereferencing a null pointer leads to undefined behavior, which can cause your program to crash or produce unexpected results.

Can you give me an example of using null pointers?

Sure! Here's a simple example:

int *ptr = NULL;
if (ptr == NULL) {
    printf("Pointer is null\n");
}