Unable to change values in a function

Question

I\'m starting with developing, sorry about this newbie question.

I need to create a function that swap values between 2 vars.

I have wrote this code, but no chan

Answer 1

You need to pass the variables by reference:

void swap_values( int& x, int& y )
{
   int z;
   z = y;
   y = x;
   x = z;
}

pass-by-value and pass-by-reference are key concepts in major programming languages. In C++, unless you specify by-reference, a pass-by-value occurs.

It basically means that it's not the original variables that are passed to the function, but copies.

That's why, outside the function, the variables remained the same - because inside the functions, only the copies were modified.

If you pass by reference (int& x, int& y), the function operates on the original variables.