c++ fonksion pointer

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Arrogant Ape answered on September 12, 2021 Popularity 10/10 Helpfulness 2/10

answer c++ fonksion pointer

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c++ fonksion pointer

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#include <stdio.h>
int f1(int x) { return x * 2; }
int f2(int x) { return x * 4; }

int main()
{
    int (*fptr1)(int) = &f1;
    fptr1 = &f2;
  	fptr1(3);
}

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Source: necatiergin2019.medium.com

Tags: c++

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Contributed on Nov 30 2021

Arrogant Ape

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pointers in C++

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A pointer is a variable that points to a location in memory. Here is an example below:

#include <iostream>//For those unaware, the lib "iostream" stands for input output stream and is used mostly for stuff like cout or cin.
//int main() is the main function which will run upon running the exe file.
int main() {
	int x = 10;//The variable we are looking to point too
	int* xptr = &x;//using "&" you get the momory location of the variable x and you are telling xptr to point to x's location.
	std::cout<<xptr<<std::endl;//prints to location it's pointing too
	std::cout<<&x<<std::endl;//If you did it correctly it will output the same thing as xptr
	std::cout<<*xptr<<std::endl;//It will print the value(10) of the variable its pointing too. this is called derefrencing
	std::cout<<x;//It will print 10.
	return 0;
}

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Source: Grepper

Tags: c++

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Contributed on Mar 20 2023

Wan Jun Yi

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c++ pointer

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Pointers are datatypes that point to a value of another
variable using its memory adress. Pointers are declared as following:
int* pointer;

The value of pointers is the adress of the variable. When someone
wishes to adress the value behind the adress, he can do it like this:
*pointer = newValue;

The *-operator (dereference operator) can also be read
as "value pointed to by". The example above could in that way be
read as "Value pointed to by pointer is now newValue".
Note that the asterisk (*) used when declaring a pointer only
means that it is a pointer (it is part of its type compound pecifier),
and should not be confused with the dereference operator.
  
You can assign the adress of variables to pointers:
int foo1 = 24;
int* pointer = &foo1;

The &-operator (adress-of-operator) can be read as "adress-of".
Therefore the line with our pointer declaration can be read like
"int-pointer with name pointer has now the value of the adress of foo1"

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Source: cplusplus.com

Tags: c++

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Contributed on Jun 28 2023

Distinct Deer

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pointer c++

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int myvar = 6;
int pointer = &myvar; // adress of myvar
int value = *pointer; // the value the pointer points to: 6

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Source: Grepper

Tags: c++

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Contributed on Sep 12 2021

FireTower

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C/C++ Pointers

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int *p1;
int * p2;

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Source: www.programiz.com

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Contributed on Apr 17 2022

Friendly Fish

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pointers in c++

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#include <iostream>

using namespace std;

int main()
{
   int x=5;
   int *ptr=&x;
   cout<<&x<<endl;        //prints the address of the variable (x)
   cout<<ptr<<endl;       //prints the address of the variable (x)
   cout<<*ptr<<endl;      //prints the value of x(5)
   cout<<&ptr<<endl;      //prints the address of the pointer (ptr)
   
   
}

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Contributed on Jun 22 2022

S.Y

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pointer cpp

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type *ptr;   // Declare a pointer variable called ptr as a pointer of type
// or
type* ptr;
// or
type * ptr;  // I shall adopt this convention

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Source: www3.ntu.edu.sg

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Contributed on Jul 26 2022

px4 firmware

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c++ pointers and functions

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#include <iostream>

using namespace std;

void increment(int *n){  		//declare argument of the functon as pointer
    *n+=1;
   cout<<"In function: "<<*n<<endl; 
}

int main()
{
   int x=5;			
   increment(&x);		//passing the address of the variable to the function
   cout<<"In main: "<<x<<endl;
   
}

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Contributed on Jun 22 2022

S.Y

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Pointers in c++

Comment

int x = 2;
int *y = &x;

cout << *y;

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Contributed on Apr 18 2022

Msk SK

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why do we use pointers in c++

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//why do we use pointers:
1)pass values by refrence to a function
2)return multiple values from a function
3)use pointers in combinational with arrays
4)dynamic memory allocation
5)use pointers in a base class in order to access object of derived class (Smart pointers)

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Source: Grepper

Tags: c++

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Contributed on Jun 23 2022

S.Y

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c++ fonksion pointer

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