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What is pointer initialization?
Assigning an initial value to a pointer variable. Example: int *p= NULL;
What always contains a pointer variable?
pointer variable in c contains the address or the location of the other variable. eg- if a=2 and address of a is 2345. b=&a then b is a pointer which contains 2345 which is the address of a. *b gives value of that is 2.
What variable has memory address as its value?
pointer
C program pointers to pointers examples?
Pointer to Pointer is a double pointer, denoted by (**). Pointer stores the address of the variable and pointer to pointer stores the address of a pointer variable and syntax can be given as int **ptr2ptr;
How are pointer different from other variables?
A pointer variable is a variable that contains the memory location of another variable or an array (or anything else in memory). Effectively, it points to another memory location. For standard variables, you define a type, assign a value to that variable or read the value from it, and you can also read the memory location (&n = memory location of n) of the variable. For pointers, you can point them to any variable, even another pointer, and you can get the value of the variable it points to (*p), the location of that variable in memory (p), or the address in memory of the pointer itself (&p). Consider: long n = 65; long *p; p = &n; Results: Type | Name | Location | Value long n 0xA3FF 65 long * p 0x31DF 0xA3FF So p points to n. Now, n = 65 &n = 0xA3FF p = 0xA3FF *p = 65 &p = 0x31DF You may find yourself having to use typecasts frequently when using pointers. Pointers are useful when passing data to functions. For instance, consider the following function: void add(int a, int b, int c) { c = a + b; } The problem here is that the computer copies each variable into a new memory location before passing them to the function as local variables. This function effectively does nothing. However, if you change the function to: void add(int a, int b, int *c) { c = a + b; } and call the function by passing in the location of the variable to the function: add(a,b,&c); then you can modify the variable itself. Pointers are also good for working with arrays: char *c = "Hello World"; int i=0; while (c[i] != 0x00) { cout << c[i]; c++ } //print one letter at a time.
Is it true or false that assigning an address to a pointer variable is valid operation?
Pointers are meant to store adresses.
What is pointer of pointer?
pointer is the variable that holds the address of another variable
What is pointer initialization?
Assigning an initial value to a pointer variable. Example: int *p= NULL;
How do you declared and initialized a pointer variable?
#include<iostream> int main() { int x=42; int* p=&x; // declare and initialise a pointer, assigning the address of x. }
In pointers what is the use of pointer variable?
Pointer is a variable that stores the address of another variable . So pointer basically stores the address of another variable and size of pointer can be evaluated by using sizeof operator.
What is void pointer variable?
A void pointer variable is a pointer variable (of some type) that is assigned the value zero, meaning it points to address zero. Memory address zero is a reserved address, which means the pointer variable references nothing in particular.
Define pointer in C?
Pointer is a variable, A variable that stores the address of another variable. Size of a pointer is 2 bytes.
What does pointer holds?
A pointer is used for pointing to a variable. It contains the address of the variable to which it points
What is a pointer variable B?
pointer variable B holds base address of B
Define pointer to pointer in c?
Double (**) is used to denote the double pointer. As we know the pointer stores the address of variable, Double pointer stores the address of any pointer variable. Declaration : int **ptr2Ptr;
What is pointer why you use pointer?
Pointer is a variable that stores the address of another variable. Since pointer is also akind of variable, thus pointer itself will be stored at a different memory location.
What always contains a pointer variable?
pointer variable in c contains the address or the location of the other variable. eg- if a=2 and address of a is 2345. b=&a then b is a pointer which contains 2345 which is the address of a. *b gives value of that is 2.
