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mÄndag 31 augusti 2020
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Advanced Security - Blockchain Support Center
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Vad tror du kommer hÀnda med Bitcoin?
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finnhult1.palle@blogger.com
söndag 30 augusti 2020
Pointers Part 1: The Basics
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.
e,g
int *pt;
Now lets say we want to store address of a variable in our pointer variable that seems pretty complex..!
int *pt = #
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:
/*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;
}
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:
printf("Address of 'var' is %p\n", &var);
printf("Address of 'var' is %p\n", pt);
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;
}
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