What if I do if(x+y=0), is that valid?

Answer 1

I suspect you made a typo and mean:
if(x + y == 0)

If this is the case then, yes, that is valid.

If, OTOH, you did not make a typo and really mean if(x + y = 0) - this is not valid since you are assigning 0 to the result of the sum of x + y. the result of x + y is also an rvalue and you cannot assign to an rvalue, only to an lvalue. It is the equivalent to ask if you can say 4 = 0.

Answer 2

if (x+y == 0 ) is valid

Answer 3

That should work, but give you undesirable result. Instead of comparison, assignment will take place. Assignment operations return a non-zero value, and the condition will evaluate to true.

Answer 4

In "IF" condition we cannot assign the value like if(x + y = 0), this is not valid.

Instead of this we need to assign the values to the variable x and y first and after that the sum of both values. See below example:-

Int x = 0;
Int y = 0;

If(x + y == 0)
{
Console.WriteLine(x + y);
}

When we are assign the values to the declared or while declaring variable at that time we are using "=". When we are comparing the values with the output at that time we are using "==". I hope it's clear. :)

Answer 5

you have to use ==
that will not work.

Answer 6

x+y==0