How to code "if (a and b) or (c and d)"

I'm writing a code where I need a conditional statement something like the following:

x = 1;
y = 2;
if (((x || y == 1) && (x || y == 3))) || (((x || y == 2) && (x || y == 3))
  fprintf('true');
else
fprintf('false');
end;

I tried this, but it keeps outputting "true", when I want it to output "false". I want it to say "If (x or y is 1) and (x or y is 3), or if (x or y is 2) and (x or y is 3), then...". But that clearly isn't what this is saying. Please help!

Answer 1

[Stephen23]

This does not do what you want (because you are not comparing x with anything, so MATLAB treats the x as true if it is non-zero):

 if (((x || y == 1) && ...

You have to compare x first, then perform the or operation:

 if (((x==1 || y==1) && ...

You can try this yourself:

>> (3 || 2==4) % 3 is non-zero, treated as true, therefore output is true
ans =  1
>> (3==4 || 2==4) % test if 3==4 and 2==4
ans = 0

[CA]

Yeah, I realized this about 10 minutes after I posted the question, but didn't know how to find my question again to correct my mistake. Thanks though!