When and how can I use the (&) operator in functions .

Question

in c++ please

Answer 1

The simplest example:

void swap(int& a,int& b)
{
int t = a;
a = b;
b = t;
}
int main()
{
int a, b;
cin>>a>>b; swap(a,b);
cout<<a<<" "<<b;
}

Answer 2

& denoted the position in memory,If you just use the variable name the value will be passed and you get only the value you need,But if you use & operator you get the address of the position and you can do two things,access value or access the position to make changes to the variable.

Answer 3

c++