pass by pointer

[strong tangle]

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[ruby plover]

Bello please help I dont understand pass by pointer,how did they swap or pass the memory addresses without using and percent "&"?

I can only notice the function call so that's progress i think.

[worthy acorn]

!sc

[strong tangle]

Zelis

Please Do Not Send Screenshots!

They're hard to read and prevent copying and pasting.

[worthy acorn]

@ruby plover

[ruby plover]

Oh ohk

[strong tangle]

@ruby plover

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Please don't delete forum posts. They can be helpful to refer to later and other members can learn from them. In the future you can use !solved to close a post and mark a post as solved.

[ruby plover]

@worthy acorn ohkay here it is

[worthy acorn]

!f

[strong tangle]

#include <iostream>
using namespace std;

Void swap(int* x, int* y) {
  Int* temp = x;
  x = y;
  y = temp;
}

Int main() {
  int x = 5;
  int y = 10;

  cout << x << endl cout << y
       << endl

              swap(x, y)

                  cout
       << x << endl cout << y << endl
}

return 0;

Oppenheimer

Formatted by Zelis

[worthy acorn]

Uh

Well, Int and Void aren't going to be understood by the compiler

Similarly you are missing semicolons in main which is why the formatting looks all weird here

and you have a return outside of a function

[ruby plover]

!format

[strong tangle]

```cpp
#include <iostream>
using namespace std;

void swap(int* x, int* y) {
  int* temp = x;
  x = y;
  y = temp;
}

int main() {
  int x = 5;
  int y = 10;

  swap(x, y);

  cout << x << endl;

  cout << y << endl;

  return 0;
}

Oppenheimer

[worthy acorn]

Looks almost perfect

[ruby plover]

Oh ohkay thanks (hope you not insinuating another re-edit)

[strong tangle]

@ruby plover Has your question been resolved? If so, run !solved :)

[ruby plover]

No lol

[craggy basalt]

in the standard library is a function called std::swap because of your use of using namespace std; its just swap, same as your written function, so actually std::swap is called since it has a version taking the parameters you are giving to it

[ruby plover]

So its not just a name its a command?

Like does it know that its really swapping?

[ruby plover]

@worthy acorn you there?

[worthy acorn]

Yep

Does your code compile?

[ruby plover]

Yes it does

[ruby plover]

Sorry for late response

[worthy acorn]

What issue are you currently running into?

[ruby plover]

Hello please help I dont understand pass by pointer,how did they swap or pass the memory addresses without using and percent "&"?

I can only notice the function call so that's progress i think.

[ruby plover]

@worthy acorn this one

Sorry for being late again im here now I switched on my notifications

[worthy acorn]

@ruby plover pointers are just the address of data in memory, use &variable to get the address of a variable and *ptr to get or set memory at an address

[ruby plover]

Yes but they swapped them here if you compile and run

You get

x=5
y=10

x=10
y=5

[ruby plover]

Also I know a bit about pointers just that I dont understand how they swapped them here

[worthy acorn]

Well in the code above the swap isn’t actually right

[ruby plover]

Oh I see whats the matter??

[worthy acorn]

Try running it and see what you get

[ruby plover]

To be honest I saw it on YouTube and the person got this@worthy acorn

[worthy acorn]

Try running the code yourself, play around with it 😉

[ruby plover]

Whats the goal here?

[ruby plover]

Coz you said this the swap is not right

[worthy acorn]

The goal is to help you see why it’s wrong and better understand the code and reason through it @ruby plover

[ruby plover]

Oh ohk my bad

[worthy acorn]

Playing around with things is an essential part of of building intuition and understanding