Pointer Representation and Pointer Example Programs

Pointer Definition

• The pointer is a programming language data type whose value refers directly to (or “points to”) another value stored elsewhere in the computer memory using its address.

Accessing The Address:

• & - Locate the Variable Address
• &variable
• ponter_variable = &variable;

Pointer Representation

// Example program for Pointer Representation 
#include<stdio.h>
#include<conio.h>
void main()
{
	int i=10;
	printf("\nValue Of i :%d",i);
	printf("\nAddress Of i :%d",&i);
}

Declaring Pointer Variables

• * and variable name
• pointer variable points to a variable of type data_type

Pointer Syntax:

data_type *pt_name;

Pointer Syntax Example:

int *p;
float *x;

Initialization Of Pointer Variable:

pointer_vaibale = &variable;

Pointer Example program: 1

// Pointer Representation Example Program : 1
#include<stdio.h>
#include<conio.h>
void main()
{
	// Declaring Variables
	int i=10;
	int *Ptr;
	
	// Assigning Pointer
	Ptr=&i;

	/ Printing Values of Pointer
	printf("\nValue Of i :%d",i);
	printf("\nAddress Of i :%d",&i);
	printf("\nValue Of Ptr :%d",Ptr);
	printf("\nAddress Of Ptr :%d",&Ptr);
	printf("\nPtr's Pointer Value:%d",*Ptr);
	printf("\nPtr Equal to &i :%d",*(&i));
}

Pointer Example Program: 2

// Pointer Representation Example Program : 2
#include<stdio.h>
#include<conio.h>
void main()
{
	// Declaring Variables and Pointer
	int i=10;
	int *Ptr;
	Ptr=&i;

	// Printing Values of Pointer
	printf("\nValue Of i :%d",i);
	printf("\nAddress Of i :%d",&i);
	printf("\nValue Of Ptr :%d",Ptr);
	printf("\nAddress Of Ptr :%d",&Ptr);
	printf("\nPtr's Pointer Value:%d",*Ptr);
	printf("\nPtr Equal to &i :%d",*(&i));

	// Change Values of Using Pointer
	printf("\n\nWe Can Change Value Of i,Without Using i");
	*Ptr=100;
	printf("\nValue Of i :%d",i);
	printf("\nAddress Of i :%d",&i);
	printf("\nPtr's Pointer Value:%d",*Ptr);
	getch();
}

How It Works

This C program demonstrates Pointer Representation and Pointer. It first prepares the data it needs, then performs the core operation step by step, and finally prints the output shown in the Sample Output above.

1. Declare the variables that hold the program’s data.
2. Print the final result to the console so you can compare it with the sample output.

Try changing the input values and re-running the program to see how the output changes — this is the fastest way to understand how the logic behaves.

Related Pages

• C Archive — Browse all C Archive.
• 2+3 and 5 are not equal In C — More in c blog.
• Confusing Array in C ( Array Representation and Initialization ) — More in c blog.
• The Use of * and & in C/C++ — More in c blog.