confuse about a test programme

[barca007]

first of all my english is poor, i hope i make my question clear.
i wrote a test programe
but i cant explain why it can get a right answer.

#include<iostream>
using namespace std;
#include<iostream>
using namespace std;
// & v1 stands for address
// same time v1 is the same as &v1

void swap(int * &v1, int * &v2){

int *temp = v2;
v2 = v1;
v1 = temp;
}


int main(){

int x = 9 , y = 6 ;

//int * p = &x;
//int * q = &y;
swap(x, y );

cout << x<<y <<endl;
system("PAUSE");

}


my questions are: what kinds parameters should this swap function take ?
i thought it should be pointers, but why it can take integers?

[Mathhead200]

If you are trying to swap int's and not int*'s then try taking references to int's (int&) as your parameters.

Example:

1 2 3 4 5 6 7 8 9 10 11 12 13 14

//this function takes 2 int's as parameters (passed by reference) void swap(int &a, int &b) { int temp = b; b = a; a = temp; } int main() { int x = 9, y = 6; swap(x, y); cout << x << ", " << y << endl; //system("pause"); return 0; }

6, 9

[Blessman11]

use google translate and write in your language (just a tip for the future).

void swap(int * &v1, int * &v2){

int temp = *v2;//this takes the value from v2 not its address as you mistakenly did. 
*v2 = *v1; //* means we are working with the value it self, not the address
*v1 = temp; 
}


int main(){

int x = 9 , y = 6 ;

//int * p = &x;
//int * q = &y;
swap(x, y );

cout << x<<y <<endl;
system("PAUSE");

}