What is the effect of dereferencing a null function pointer?

In practice, dereferencing a null pointer may result in an attempted read or write from memory that is not mapped, triggering a segmentation fault or memory access violation. This may manifest itself as a program crash, or be transformed into a software exception that can be caught by program code.

What does dereferencing a null pointer mean?

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Extended Description. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.

What happens when you dereference a null pointer C++?

Dereferencing a null pointer always results in undefined behavior and can cause crashes. If the compiler finds a pointer dereference, it treats that pointer as nonnull. As a result, the optimizer may remove null equality checks for dereferenced pointers.

What is null Dereferencing error?

A NULL pointer dereference is a sub type of an error causing a segmentation fault. It occurs when a program attempts to read or write to memory with a NULL pointer. Consequences. Running a program that contains a NULL pointer dereference generates an immediate segmentation fault error.

IS NULL pointer and Uninitialised pointer answer ab True False?

Explanation: No the NULL pointer same as an uninitialised pointer.

What does the dereference operator will return?

What does the dereference operator will return? Explanation: It operates on a pointer variable, and returns an l-value equivalent to the value at the pointer address.

WHAT IS NULL pointer and when is null pointer used?

A null pointer is a pointer which points nothing. Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isn’t assigned any valid memory address yet. b) To pass a null pointer to a function argument when we don’t want to pass any valid memory address.