USES OF POINTERS:-
#include<stdio.h>
void main( )
{
int a;
printf("enter a value\n");
scanf("%d",&a);ekrnfkj
printf("the value of a=%d",a);
printf("the value of a=%p",&a);
printf("the value of a=%d",*(&a));
}
- Dynamic Memory Allocation ( D M A)
- A Function can return more than one value
- Implementing data structures
- call by reference is possible by pointer
ADDRESS OPERATOR:- ( &)
In C '&' is an address operator. Which returns address of a variables.
Ex: -
int a ;
a is integer type of variable.
&a means address of a variable a.
/* Program for printing address of a variable */
#include<stdio.h>
void main( )
{
int a;
printf("enter a value\n ");
scanf("%d",&a);
printf("the variable a have =%d", a);
printf("the address of a is =%p",&a);
}
POINTER VARIABLE:-
Pointer variables is also same as a normal variables. But the only difference is normal variables holds the values or data. But the pointer variables holds the
address of another same type of variable.
Syntax:-
Datatype * pointer_variable_name;
Ex:-
int *ptr;
char *ch;
float *f;
/* Program for dereferencing a value*/
- Asterisk " * " is an indirection operation, which can read as " values at the address ". Its nothing but a dereferencing a value.
#include<stdio.h>
void main( )
{
int a;
printf("enter a value\n");
scanf("%d",&a);ekrnfkj
printf("the value of a=%d",a);
printf("the value of a=%p",&a);
printf("the value of a=%d",*(&a));
}
Assigning a variable address to a pointer variable:-
Address of a variable is assigned to a pointer variable by using assignment operator.
Ex:-
int a;
int *ptr;
ptr=&a;
here, the address of a variable a is assigned to a pointer variable ptr.
i.e ptr holds the address of a;
// Program for how to hold the address of a variable
#include<stdio.h>
void main ( )
{
int a,*ptr;
ptr=&a;
printf("enter a variable\n");
scanf("%d",&a);
printf("value of a =%d\n",a);
printf("value of ptr =%p\n",p);
printf("address of a =%p\n",&a);
printf("ptr pointing tthe value =%d\n",*ptr);
}
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