What does this mean in C# =-?

[Dave Jones]

I am confuse in what is the function of that in C#: =- ??

Can please someone help me and explain to me what it does in C#?

Thanks in advance

[Disch]

I'm pretty sure =- is not a C# operator. It's just doing = then -

foo = -foo;  // negate a number 

[Dy7SLyTq]

please dont double post

[Dave Jones]

can you explain to me a bit more in detail what does it mean to negate a number? let's say foo = 4 ; what would foo = -foo, now mean?

[Dy7SLyTq]

it means that its the opposite of what it is
so

lets say a = 4
foo = -a //foo = -4
a = -a //a = -4
foo = -a // foo = 4

[Disch]

int foo = 4;

// foo is 4  (positive 4)

foo = -foo;

// foo is -4  (negative 4) 

[Dave Jones]

Thank you DTScode and Disch for taking the time to answer this question. Thank you for the support. I understand it now