So you're eager to learn about pointers but unfortunately you got stuck because they seemed to you terrible in nature? That's not true I know, but many of the people get confused when they arrive at the topic of pointers. Well pointers are the most important tools in C programming and are the one that can make you fly (unless you don't know how to ride over them). In this article we're going to learn basics of pointers.
Pointers are the varaibles that store addresses of other variables. Easy ain't it?
So lets start with the decleration of a pointer, pointer is decreleared as:
data_type *var_name;
e,g
int *pt;
e,g
int *pt;
well the astrisk(*) before the variable name is the thing that makes variable a pointer. So far so good now what?
Now lets say we want to store address of a variable in our pointer variable that seems pretty complex..!
Now lets say we want to store address of a variable in our pointer variable that seems pretty complex..!
Let's do it:
int number = 100;
int *pt = #
int *pt = #
Is it really complex..?
what we are doing here is that we are first declaring and initializing a integer variable (number) with value of 100 and then we declare and initialize a pointer variable (pt) with the address of number variable. Now pt (pointer variable) contains the address of number (integer varaible). So what? Now we can use this pointer variable to change the value of number variable. Is this some kind of Magic? Maybe. Lets' do it:
what we are doing here is that we are first declaring and initializing a integer variable (number) with value of 100 and then we declare and initialize a pointer variable (pt) with the address of number variable. Now pt (pointer variable) contains the address of number (integer varaible). So what? Now we can use this pointer variable to change the value of number variable. Is this some kind of Magic? Maybe. Lets' do it:
*pt = 200;
what we have done here is that we De-referencing the pt variable with the asterisk (*) and then assigned it the value of 200 now the number variable contains 200. Isn't it a magic? De-referencing is used for accessing the value of the variable towards which our pointer is pointing simple. So lets write a full program of what we have learned so far.
/*Pointer Basics: Creating and Using Pointers*/
#include<stdio.h>
int main(void){
int number = 100;
int *pt = &number;
printf("Value of 'number' is: %d", number);
printf("Address of 'number' is: %p", pt);
*pt = 200;
printf("New value of 'number' is: %d", number);
return 0;
}
What this whole program did was it created a integer variable and a pointer to integer variable and then printed out the value and address of the 'number' variable and after that we De-referenced the pointer variable so that we can access the value to which our pointer variable is pointing and changed the old 100 value with new 200 value and at last we printed that out. Easy isn't it?
But do you know that you can get the address of a variable even by using ampersand (&) operator? Lemme show you how. I'll declare and initialize a variable 'var' and then print it to screen using ampersand (&) operator:
But do you know that you can get the address of a variable even by using ampersand (&) operator? Lemme show you how. I'll declare and initialize a variable 'var' and then print it to screen using ampersand (&) operator:
int var = 10;
printf("Address of 'var' is %p\n", &var);
printf("Address of 'var' is %p\n", &var);
the last statement here will print out the address of 'var' not value so that means it is equal to this statement:
int *pt = &var;
printf("Address of 'var' is %p\n", pt);
printf("Address of 'var' is %p\n", pt);
here we first assigned the address of 'var' to pointer variable 'pt' and then printed out the address of 'var' using the pointer variable (pt).
So lets write another program that will wrap up this part of 'Pointer Basics':
So lets write another program that will wrap up this part of 'Pointer Basics':
/*Pointer Basics Part 1: Program 2*/
#include<stdio.h>
int main(void){
int var = 10;
int *pt = &var;
printf("The Value of 'var' is: %d\n", var);
printf("De-referencing: *pt = %d\n", *pt);
printf("Ampersand: The Address of 'var' is %p\n", &var);
printf("pt = %p\n", pt);
return 0;
}
So that's the end of first part watch out for the next part in which we'll tighten our grip on pointers and get ready for some Advanced '*po(inter)-fo'.
- Hack Tool Apk
- Pentest Tools Download
- World No 1 Hacker Software
- Hacker Tools For Ios
- Nsa Hack Tools Download
- Pentest Tools Github
- Hacker Tools Free Download
- Hackers Toolbox
- Bluetooth Hacking Tools Kali
- Hacking Tools Hardware
- Hack And Tools
- Pentest Tools Review
- Hacker Security Tools
- Hacker Tools 2020
- Hak5 Tools
- Pentest Tools Linux
- New Hack Tools
- Computer Hacker
- Top Pentest Tools
- Hacking Tools Windows 10
- Pentest Recon Tools
- Pentest Tools Framework
- Pentest Tools Open Source
- Pentest Tools Review
- Hack Tools Online
- Hacker Tools Apk Download
- What Are Hacking Tools
- Hacking Tools Hardware
- Hacking Tools 2020
- Hack Rom Tools
- Hacking Tools And Software
- Pentest Tools For Ubuntu
- Hacking Tools For Mac
- Pentest Tools For Mac
- Tools 4 Hack
- Hacker Tools Apk
- Pentest Tools Kali Linux
- Hacker Tools 2019
- Termux Hacking Tools 2019
- Tools 4 Hack
- Hack Rom Tools
- Pentest Tools Review
- Pentest Tools Download
- Game Hacking
- Hacker Tools 2020
- Hacker Security Tools
- Hacker Tools Linux
- Hacker Tools
- Hack Tools Github
- Hacking Tools
- Bluetooth Hacking Tools Kali
- Hacker Tools Software
- Hacker Techniques Tools And Incident Handling
- Beginner Hacker Tools
- Hacker Security Tools
- Game Hacking
- Underground Hacker Sites
- Hacking Tools Pc
- Hacking Tools 2020
- Hack Tools Github
- Hack Website Online Tool
- What Are Hacking Tools
- Hacker Tools 2020
- Hacking Tools Download
- Hacking Tools Online
- Pentest Tools Review
- Pentest Tools Online
- Hack Tools Github
- Blackhat Hacker Tools
- Ethical Hacker Tools
- Termux Hacking Tools 2019
- Hack Tools
- Hacker Tools List
- How To Install Pentest Tools In Ubuntu
- Hacks And Tools
- Hacking Tools Usb
- Nsa Hack Tools Download
- What Are Hacking Tools
- Hacker Tool Kit
- Game Hacking
- Hacker Tools For Windows
- Best Hacking Tools 2019
- Hacking Tools For Windows 7
- Pentest Tools Subdomain
- Hacking Tools Windows
- Hacking Tools Mac
- How To Make Hacking Tools
- Tools Used For Hacking
- Hacking Tools For Windows Free Download
- Pentest Tools List
- Hacker Tools For Mac
- Pentest Tools Open Source
- Hacker Tool Kit
- Hack And Tools
- Pentest Tools Github
- Underground Hacker Sites
- Pentest Tools Linux
- Hacking Tools For Kali Linux
- Hacking Tools Software
- Hacker Tools
- Growth Hacker Tools
- Pentest Tools Open Source
- Best Hacking Tools 2019
- Pentest Tools Review
- What Is Hacking Tools
- Hacking Tools Mac
- Hacker Tools
- Pentest Tools Android
No comments:
Post a Comment