pointer

gagan7230

what is difference bw pointer and const pointer....

niranjan

/*declear variable & pointer variable*/

int m=300,*pi;

float fx= 300.600006, *pf;
char cht='z',*pc;

Query regarding store address of variable in stack? I am using 64bit PC. What address of char variable(cht) stores before addrees of m?

Output as below-

Address of m=0x7ffc0e97b628
Address of fx=0x7ffc0e97b62c
Address of cht=0x7ffc0e97b627 - ?
Address of pi=0x7ffc0e97b630
Address of pf=0x7ffc0e97b638
Address of pc=0x7ffc0e97b640

store address of pointer variable 8 byte due to 64 bit. store pointer address is machine dependent!

ritde1

In a pointer the address can be changed, but in a const pointer the address cannot be changed.

rakeshsingh59432

In pointer i want to performe addition with pointer i faces many bugs but i finally i got a final result

main: Begin

enter the value of a and b

67

89

addition: Begin

addition: End

display: Begin

67 + 89 = 156

display: End

main: End

rohitkumarkbd1234

What is a Null Pointer?

rohitkumarkbd1234

What is a generic pointer? When can we use a generic pointer?

rohitkumarkbd1234

What is the difference between a null pointer and an uninitialized pointer?

rohitkumarkbd1234

What is the size of a generic pointer

rohitkumarkbd1234

What is the output of the below program? The assumed size of char, int, and double is 1,4,8.

#include<stdio.h>

int main()

{

int a, b, c;

char *p = 0;

int *q = 0;

double *r = 0;

a = (int)(p + 1);

b = (int)(q + 1);

c = (int)(r + 1);

printf("%d %d %d",a, b, c);

return 0;

}

gaurav133232

Null pointer is a pointer that doesn't point anywhere. it is declared as:

int* a = NULL;

gaurav133232

Generic pointers are the pointers which don't have any specific type i.e. void*, since we don't know what kind of data is stored in them. We can use them when we don't know which type of data to point to.

mohammaduvais143

Null pointer does not pointing to anything

mohammaduvais143

Generic pointer is also known as void* pointer the size of void* pointer on 32-bits system is 4 bytes and 64-bits system 8 bytes

mohammaduvais143

Generic pointer is a pointer which is not associated with any data types

It points to the data location in the memory which means it stores the address of variable

we can type casting according to requirement

mdaliakbar

NULL POINTER->A Null Pointer is a pointer that does not point to any memory location. It store
the base address of the segment.

Null pointer means that the pointer is referring to the 0th memory location.
EG

int *ptr=(int *)0;
float *ptr=(float *)0;
char *ptr=(char *)0;
double *ptr=(double *)0;
char *ptr='\0';
int *ptr=NULL;

pointer

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