Meaning of referencing and dereferencing in C I read different things on the Internet and got confused, because every website says different things I read about * referencing operator and amp; dereferencing operator; or that referencing means
What does dereferencing a pointer mean in C C++? int *p; would define a pointer to an integer, and *p would dereference that pointer, meaning that it would actually retrieve the data that p points to
What exactly is meant by dereferencing a NULL pointer? Dereferencing just means accessing the memory value at a given address So when you have a pointer to something, to dereference the pointer means to read or write the data that the pointer points to In C, the unary * operator is the dereferencing operator If x is a pointer, then *x is what x points to The unary operator is the address-of operator If x is anything, then x is the address
Why do we get possible dereference null reference warning, when null . . . #nullable enable class Program { static void Main() { var s = ""; var b = s == null; If you comment this line out, the warning on the line below disappears var i = s Length; warning CS8602: Dereference of a possibly null reference } } After reading the documentation I linked to above, I would expect the s == null line to give me a warning—after all s is clearly non-nullable, so
c - understanding the difference between pointer dereference and array . . . But in there is no deference There is no dereference only in the sense that the dereference operator * is not used However, dereference is still there, because index operator [] in C is an equivalent of *: the two are completely interchangeable in all situations When you see x[i] you can rewrite it as *(x+i), and vice versa The ability to rewrite a dereference of an addition as index