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'.
Read more
- Hacker Tools 2019
- Hacker Tools Free Download
- Best Hacking Tools 2020
- Hacking Tools Mac
- Pentest Tools Alternative
- Hacker Tools List
- Tools 4 Hack
- Pentest Tools Windows
- Hacking Apps
- Pentest Tools Linux
- Hacking Tools For Kali Linux
- Black Hat Hacker Tools
- Hacking Apps
- Free Pentest Tools For Windows
- Easy Hack Tools
- Hacking App
- Hack Tool Apk No Root
- Hacker Tool Kit
- Pentest Tools Url Fuzzer
- Hacker
- Pentest Tools Url Fuzzer
- Pentest Tools
- Best Pentesting Tools 2018
- Hacker Tools Online
- Hacker Tools Apk Download
- Hacking Tools Free Download
- Hacking Tools For Games
- Top Pentest Tools
- Hacker Tools For Windows
- Pentest Tools Review
- Hacker Tools Free
- Hackrf Tools
- Hacker Tools For Ios
- Pentest Tools Framework
- Hacking Tools Free Download
- Nsa Hack Tools
- Hacking Tools For Beginners
- Hacker Tools Online
- Hacking Tools Online
- Hack Tools Github
- Hacking Tools For Kali Linux
- Pentest Recon Tools
- Hack Tools Mac
- Hack Apps
- Pentest Reporting Tools
- Pentest Tools Free
- Usb Pentest Tools
- How To Make Hacking Tools
- Hack Tools
- Pentest Tools Port Scanner
- Hacker Security Tools
- Termux Hacking Tools 2019
- Underground Hacker Sites
- Wifi Hacker Tools For Windows
- Pentest Recon Tools
- Hack Tools For Ubuntu
- Install Pentest Tools Ubuntu
- Hacking Tools For Games
- Hack App
- Hacker Tools Free Download
- Pentest Tools Windows
- Hack Tools For Pc
- Pentest Tools Download
- Pentest Tools
- Blackhat Hacker Tools
- Bluetooth Hacking Tools Kali
- Game Hacking
- Hacking Tools For Kali Linux
- Hacker Tools Apk
- Pentest Tools Download
- Termux Hacking Tools 2019
- Blackhat Hacker Tools
- How To Make Hacking Tools
- Top Pentest Tools
- Hacking Tools For Beginners
- Best Hacking Tools 2019
- Blackhat Hacker Tools
- Hack Tools For Ubuntu
- Game Hacking
- Tools Used For Hacking
- Hack Tool Apk
- Github Hacking Tools
- Hacking Tools Kit
- Hacking Tools Windows
- Hacking Tools For Windows Free Download
- Hack Tools Online
- Pentest Tools Windows
- Hacking Tools Online
- Hacking Tools Free Download
- Hack Tool Apk
- New Hacker Tools
- Hacking Tools Download
- Usb Pentest Tools
- Pentest Tools Website Vulnerability
- Pentest Tools For Mac
- Pentest Tools Download
- Hak5 Tools
- Hacker Hardware Tools
- Pentest Tools Android
- Hacking Tools Windows
- Pentest Tools Open Source
- Hack Tool Apk No Root
- Hacker Tools Github
- Pentest Tools For Mac
- Hack Website Online Tool
- Nsa Hacker Tools
- Pentest Tools For Windows
- Hacking Tools 2019
- Hacker Hardware Tools
- Best Hacking Tools 2019
- Pentest Tools For Windows
- Hacker Tools Apk
- Hacking Tools
- Hacker Tools Mac
- Hacker Tools Software
- Pentest Tools Review
- Pentest Tools For Windows
- Hackers Toolbox
- How To Install Pentest Tools In Ubuntu
- Hack Tools For Pc
- Hacks And Tools
- Hacker Tools Software
- World No 1 Hacker Software
- Game Hacking
- Hacker Tools Mac
- Pentest Tools Framework
- Hacker Tools For Pc
- How To Hack
- Hacker Hardware Tools
- Tools 4 Hack
- Pentest Tools Kali Linux
- Pentest Automation Tools
- Pentest Tools Framework
- Pentest Tools Url Fuzzer
- Hack App
- Hacking Tools 2020
- Ethical Hacker Tools
- Hacker Tools Windows
- Github Hacking Tools
- Hack Tool Apk
- Pentest Tools Bluekeep
- Hacks And Tools
- Best Pentesting Tools 2018
- Nsa Hacker Tools
- Hacker Tools 2019
- Hack Apps
- Hacker Tools Software
- Pentest Tools Free
- Hack Tool Apk No Root
- Wifi Hacker Tools For Windows
No comments:
Post a Comment