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Make a positive number a negative number in 1 line of C# code – A code quiz!

Here are 4 methods, each one is meant to turn a positive number into a negative.

public int ReturnMinusVersion1(int i)
{
    return -i;
}

public int ReturnMinusVersion2(int i)
{
    return --i -i +i;
}

public int ReturnMinusVersion3(int i)
{
    return ~i + 1;
}

public int ReturnMinusVersion4(int i)
{
    return i * -1;
}

The questions are:

Which methods compile?

Which methods produce the correct result?

Explain why the working methods work.

Which is best and why?

Any other cool ways of making a positive number a negative? Have fun!

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