This type of syntax is called a ternary operator. They are generally used to perform simple expressions, or assign things to ONE variable based on a condition, rather than handle assignment logic with two variables.
This is why you can’t have both a = TRUE and b = TRUE in the ternary operator. You should only have values or things that return values in there.
e.g.
BOOL result = (num == 21 ? TRUE : FALSE);
BOOL a = result;
BOOL b = !result;
Read more on ternary operators on Mozilla’s documentation
Also, slightly unrelated to your actual question, but still an issue you should fix; Lee Daniel Crocker made a good point. FALSE shouldn’t really be defined as 1, as it is usually defined as 0 in most programming contexts. TRUE is defined as any number other than 0, i.e. !FALSE. Hence, try doing this to define your TRUE and FALSE:
#define FALSE 0
#define TRUE !FALSE
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solved Strange things happen with bool? [closed]