C Programming Files

CSE 101

(Unit-4)


Pointers




CSE 101 Problem Solving and Programming in C

, Introduction
– Variable hold address of another variable
– Using address operator (&)
– Eg:
pv = &v

• Declaration
Datatype *variable_name
(or)
Datatype* variable_name

• Address assignment
ptr = & var // ptr=&value – error (& only always with variable name)

• Accessing element (value) in var
*ptr

• Accessing address of var
ptr (or) &var
21-Nov-24 CSE 101 Problem Solving and Programming in C

, Example 1

int main()
{
int a=10;
int *p;
p=&a;
printf("Address of a variable A is:%x\n",&a);
printf("Address stored in a variable p is:%x\n",p);
printf("Value stored in a variable p is:%d\n\n",*p);
a=50;
printf("Address of a variable A is:%x\n",&a);
printf("Address stored in a variable p is:%x\n",p);
printf("Value stored in a variable p is:%d\n\n",*p);
*p=100;
printf("Address of a variable A is:%x\n",&a);
printf("Address stored in a variable p is:%x\n",p);
printf("Value stored in a variable p is:%d\n\n",*p);
}

21-Nov-24 CSE 101 Problem Solving and Programming in C