any body can explain this ?

Question

1.50/5 (2 votes)

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C#

#include<iostream>
#include<conio.h>
using namespace std;

void AAA (int* & x,int *y)
{
    cout<<y<<endl;
    cout<<x<<endl;
}
    void main()
{
    int x=5;
    int *y=&x;

    AAA(y,y);
    getch();

}

what is mean both of { int* & x,int *y }

Posted 3-Aug-12 18:09pm

Anderso0on

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Sergey Alexandrovich Kryukov 17-Oct-12 15:51pm

This is not a productive way of asking questions. Better develop your own code based on reading manuals, show it if you stuck.
--SA

2 solutions

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Christian Graus · Accepted Answer · 2012-08-03T18:37:00

Solution 1

int * is a pointer to a memory address that contains an int. int * y = &x means x and y are both the SAME int instance only one int is created here. However, its also the one pointer being passed twice, because you pass y twice, the x and y in AAA are both the y in your main, because that's what you passed in.

main always returns int in valid C++

Posted 3-Aug-12 18:37pm

Christian Graus

Comments

Anderso0on 4-Aug-12 0:39am

but what is different between
int* & x,int *y
?????

Christian Graus 4-Aug-12 0:43am

&x means, the address of x. If x is an int, &x is an int *. int * y = &x means, declare a pointer to an int, called y, and set it's value to be the address of the int, x. You should probably talk to your teacher if you're confused, we're happy to help, but if you're not getting my answers, your teacher can help better.

_Amy 4-Aug-12 12:04pm

Nicely explained. +5!

Anderso0on 4-Aug-12 0:49am

thanks alot

BillW33 6-Aug-12 9:21am

Good explanation, +5

Volynsky Alex · Accepted Answer · 2012-08-04T05:28:00

Solution 2

Pointer declarations are better off to be read from right to left for better understanding!!
int* & x is a reference to a pointer to an int
int *y is a pointer to an int

To learn more, please look here:
http://stackoverflow.com/questions/5789806/meaning-of-and-in-c[^]
http://stackoverflow.com/questions/4185776/what-does-mean-in-a-function-parameter[^]
http://stackoverflow.com/questions/57483/what-are-the-differences-between-pointer-variable-and-reference-variable-in-c[^]

Posted 4-Aug-12 5:28am

Volynsky Alex

Comments

BillW33 6-Aug-12 9:21am

Nice references, +5

Volynsky Alex 6-Aug-12 9:56am

Thanks CIDev!

Amarnath S 7-Aug-12 7:34am

Is there a way to bookmark your solution? I'd like to bookmark it.

BillW33 7-Aug-12 9:31am

@Amarnath, To bookmark a solution click the icon that looks like a star with a plus sign at the bottom right of the solution.

Amarnath S 8-Aug-12 12:29pm

@CIDev, thanks. Somehow, I missed that star icon amidst all the contents of this page. I was looking for it at the top, and it is in the bottom.