Pointer in C is a variable that stores the address of another variable. The document discusses pointers in C including syntax, accessing pointers, and common mistakes made when working with pointers. It shows how to declare a pointer variable, take the address of a variable and store it in a pointer, dereference a pointer to access the value at the address, and how the value is changed when accessed through a pointer or variable.

1. Pointer in C
Md. Shafiuzzaman
Lecturer, Dept. of CSE, JUST

2. Address
scanf("%d", &var);

3. Address
#include <stdio.h>
int main()
{
int var = 5;
printf("var: %dn", var);
printf("address of var: %p", &var);
return 0;
}
var: 5
address of var: 2686778

4. Pointer Syntax
int *p1;

5. Access to Pointers
int* pc, c;
c = 5;
pc = &c;
printf("%d", *pc); // Output: 5

6. Access to Pointers
int* pc, c;
c = 5;
pc = &c;
c = 1;
printf("%d", c); // Output: 1
printf("%d", *pc); // Ouptut: 1

7. Access to Pointers
int* pc, c;
c = 5;
pc = &c;
*pc = 1;
printf("%d", *pc); // Ouptut: 1
printf("%d", c); // Output: 1

9. Common mistakes when working with
pointers