Is there a method in c# that returns the number that was sent to it but with a minus sign?

Question

C++ / C#

If not, please advise how this can be done.

Answer 1

int Minus (int input)
{
return Math.Abs(input)*-1;
}

This is if you want the negative to remain negative. And if you just invert the sign - so multiply by -1.

Answer 2

-MyNumber

Answer 3

int Minus(int i){
if(i>0)
 return -1*i;
else return i;
}