Rather, the void pointer must first be explicitly cast to another pointer type before it is dereferenced. int nValue = 5; void *pVoid = &nValue; // can not dereference pVoid because it is a void pointer int *pInt = static_cast<int*>(pVoid); // cast from void* to int* cout <<...
What is a dangling pointer in C++?C++ Programming Interview Question Answer:A dangling pointer arises when you use the address of an object afterits lifetime is over. This may occur in situations like returningaddresses of the automatic variablesfrom a function or using theaddress of the memory...
Apointeris a very powerful and sophisticated feature provided in the C language. A variable defined in a program the compiler allocates a space in thememoryto store its value. The number of bytes allocated to the variable depends on itstype.For instance, acharacteris allocated 1 byte, aninti...
Here using the NULL pointer you can avoid theundefined behaviorof your C program. Now you are thinking how; don’t worry I am explaining the way. In C/C++ programming a null pointer is guaranteed to compare unequal to a pointer to any object or function; that means(ptr1 == ptr2)isfa...
This is a more advanced concept where a pointer can point to a function, enabling dynamic function calls. This technique is often seen in implementing callback functions. 9. Dynamic Memory Allocation Manual memory management in C is crucial, and pointers are at its heart. ...
double *db_ptr ### db_ptr is a pointer to data of type double Note: The size of any pointer in C is same as the size of an unsigned integer. Hence it is Architecture dependent. Pointer Assignment The addressof (&) operator, when used as a prefix to the variable name, gives the ...
CHAPTER 1: What is a pointer? One of those things beginners in C find difficult is the concept of pointers. The purpose of this tutorial is to provide an introduction to pointers and their use to these beginners. I have found that often the main reason beginners have a problem with pointe...
What is a pointer CHAPTER1:Whatisapointer? OneofthosethingsbeginnersinCfinddifficultistheconceptofpointers.Thepurposeofthistutorialistoprovideanintroductiontopointersandtheirusetothesebeginners. Ihavefoundthatoftenthemainreasonbeginnershaveaproblemwithpointersisthattheyhaveaweakorminimalfeelingforvariables,(as...
class Car { public: int speed; }; int main() { int Car::*pSpeed = &Car::speed; return 0; } Why does C++ have this pointer to a non-static data member of a class? What is the use of this strange pointer in real code?c++...
class Car { public: int speed; }; int main() { int Car::*pSpeed = &Car::speed; return 0; } Why does C++ have this pointer to a non-static data member of a class? What is the use of this strange pointer in real code?c++...