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

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CA
CA 2016-12-5
评论： CA 2016-12-5
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!

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采纳的回答

Stephen23
Stephen23 2016-12-5
编辑：Stephen23 2016-12-5
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
  1 个评论
CA
CA 2016-12-5
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!

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