How do void pointers work in C++?
How do void pointers work in C++?
A void pointer is a pointer that can point to any type of object, but does not know what type of object it points to. A void pointer must be explicitly cast into another type of pointer to perform indirection. A null pointer is a pointer that does not point to an address. A void pointer can be a null pointer.
What is void pointer explain with example?
A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type. Note that the above program compiles in C, but doesn’t compile in C++. In C++, we must explicitly typecast return value of malloc to (int *).
How do you use void pointer?
The void pointer in C is a pointer which is not associated with any data types. It points to some data location in the storage means points to the address of variables. It is also called general purpose pointer. In C, malloc() and calloc() functions return void * or generic pointers.
How do I print a void pointer?
Output
- #include
- int main()
- {
- int a=90;
- void *ptr;
- ptr=&a
- printf(“Value which is pointed by ptr pointer : %d”,*(int*)ptr);
- return 0;
Why do we use void pointer in C++?
void pointer in C / C++ A void pointer is a pointer that has no associated data type with it. A void pointer can hold address of any type and can be typcasted to any type. In C++, we must explicitly typecast return value of malloc to (int *). 2) void pointers in C are used to implement generic functions in C.
Should you use void pointers C++?
void pointers should be used any time the contents of a block of data is not important. For example when copying data the contents of a memory area is copied but the format of the data is not important. Often functions a coded to take a char * to handle blocks of memory when the function is actually content agnostic.
What is void pointer and NULL pointer?
A null pointer points has the value NULL which is typically 0, but in any case a memory location which is invalid to dereference. A void pointer points at data of type void. The word “void” is not an indication that the data referenced by the pointer is invalid or that the pointer has been nullified.
What is void * C++?
void (C++) When used as a function return type, the void keyword specifies that the function doesn’t return a value. When used for a function’s parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is “universal.”
What is use of void pointer?
Can a void pointer point to anything?
3 Answers. A void pointer is a pointer to anything. It is a generic pointer that doesn’t have a particular type. It can also have the value NULL in which case it doesn’t point to anything.
How do you cast a void pointer?
Example program:- ptr=&a // Assigning address of integer to void pointer. printf(“The value of integer variable is= %d”,*( (int*) ptr) );// (int*)ptr – is used for type casting. Where as *((int*)ptr) dereferences the typecasted void pointer variable. ptr=&b // Assigning address of float to void pointer.
What is void * in C?
void* is a ‘pointer to memory with no assumptions what type is there stored’. You can use, for example, if you want to pass an argument to function and this argument can be of several types and in function you will handle each type.
What does a void pointer mean in C + +?
A void pointer is A pointer that has no associated data type with it. A void pointer is a general purpose pointer that can hold address of any type and can be typecasted to any type. The void pointer doesn’t mean it points to nothing.
Can a void pointer be converted to a float?
However, if we convert the void* pointer type to the float* type, we can use the value pointed to by the void pointer. In this example, we have used the static_cast operator to convert the data type of the pointer from void* to float*.
Is it possible to do arithmetic on a void pointer?
It points to some data location in storage means points to the address of variables. It is also called general purpose pointer. Pointer arithmetic is not possible of void pointer due to its concrete size.
Can a variable be assigned to a pointer in C + +?
In C++, we cannot assign the address of a variable of one data type to a pointer of another data type. Here, the error occurred because the address is a double type variable.