Pointers

Module 1: Pointers

• Pointers and Address basics

• Pointer Arithmetic

• Pointer to Pointer

Pointer to Pointer

Pointer to Pointer

#include<stdio.h>

void main()

{

                int a = 5;

                int *p;

                int **q;

                p = &a;

                q = &p;

                printf("\n a = %d", a);

                printf("\n &a = %p", &a);

                printf("\n  p = %p",  p);

                printf("\n  *p = %d",  *p);

                printf("\n  &p = %p", &p);

                printf("\n q = %p", q);

                printf("\n  *q = %p", *q);

                printf("\n  **q = %d", **q);

                printf("\n &q = %p", &q);

}

Output:

 a            = 5

 &a         = 0028FF44

 p            = 0028FF44

 *p          = 5

 &p         = 0028FF40

 q            = 0028FF40

 *q          = 0028FF44

 **q        = 5

 &q         = 0028FF3C

Pointer Arithmetic

Pointer Arithmetic

#include<stdio.h>

void main()

{

                char c = 'x', *pc;

                int i = 11, *pi;

                float f = 35.6, *pf;

                pc = &c;

                pi = &i;

                pf = &f;

                printf("\nValue of pc = Address of c = %p ", pc);

                printf("\nValue of pi = Address of i = %p ", pi);

                printf("\nValue of pf = Address of f = %p ", pf);

                pc++;

                pi++;

                pf++;

                printf("\nNow Value of pc = %p", pc);

                printf("\nNow Value of pi = %p", pi);

                printf("\nNow Value of pf = %p", pf);

}

Output:

Value of pc  =     Address of c       = 0028FF47

Value of pi   =     Address of i        = 0028FF3C

Value of pf   =    Address of f       = 0028FF34

Now Value of pc = 0028FF48

Now Value of pi = 0028FF40

Now Value of pf = 0028FF38

Pointers and address basics

Pointers and Address

#include<stdio.h>

void main()

{

                 int a = 10;

                float b = 35.6;

                int *p1;

                float *p2;

                p1 = &a;

                p2 = &b;

                printf("\nAddress of a = %p ", &a);

                printf("\nAddress of b = %p ", &b);

                printf("\nValue of a = %d %d %d", a, *p1, *(&a));

                printf("\nValue of b = %.1f %.1f %.1f", b, *p2, *(&b));

                printf("\nValue of p1 = Address of a = %p ", p1);

                printf("\nValue of p2 = Address of b = %p ", p2);

                printf("\nAddress of p1 = %p ", &p1);

                printf("\nAddress of p2 = %p ", &p2);

}

Output:

Address of a = 0028FF44

Address of b = 0028FF40

Value of a = 10    10   10

Value of b = 35.6   35.6   35.6

Value of p1 = Address of a = 0028FF44

Value of p2 = Address of b = 0028FF40

Address of p1 = 0028FF3C

Address of p2 = 0028FF38

Structures

Module 1: Structure

• Structure Template
• Structure Variable Declaration
• Structure Variable Initialization
• Structure and Pointer
• Array within Structure
• Array of Structures
• Structures and Functions 
•          Passing Individual Structure Members
•          Passing Structure Variable 
•          Passing Address of Structure Variable 
• Nested Structures