Question

I have been asked to “Write a function that swaps two integers(I am not allowed to use arithmetic or Boolean operators for this) and returns the result”
Unfortunately I have encountered a slight problem. I think I have managed to swap the integers using the XOR algorithm that was suggested but I am not to sure how to return the values. I am quite poor at programming but I hope I have explained this sufficiently enough.

Here is the code so far:

static void Main(string[] args)
{
    //numberSwap?(int number1, int number2)
}

public int numberSwap(int number1, int number2)
{
    number1 ^= number2;
    number2 ^= number1;//I think this is correct
    number1 ^= number2;

    int result = number1, number2;
    return result;// I think I may have this wrong
}

as mentioned above I think that I may have the result assignment and return wrong as well as the called function.

Answer 1

The reason the number didn’t got swapped because you passed the parameter by value, you were supposed to pass the parameter by reference

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Passing parameter By Value : create a copy of the variable that is sent to the parameter.

Passing parameter By Reference modifies the parameter that is passed, and does not create any copy of the variable.

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Your function logic is correct the only tiny thing you missed was passing it As Reference

public void numberSwap(ref int number1, ref int number2)
{
    number1 ^= number2;
    number2 ^= number1;
    number1 ^= number2;
}

and the call to function must be like :

static void Main(string[] args)
{
    int n1 = 5, n2 = 10;
    numberSwap(ref n1, ref n2)
}