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I reading this code, and have this line
switch (!!up + !!left) { what is !! operator ? two logical NOT ?
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C NOT Logical Operator is used to inverse the result of a boolean value or an expression. ! is the symbol used for NOT Logical Operator in C programming. C NOT Operator takes only one boolean value as operand and returns the result of NOT operation.
Logical OR (||) operator in C Logical OR is denoted by double pipe characters (||), it is used to check the combinations of more than one conditions; it is a binary operator – which requires two operands.
The result of a logical OR ( || operator in C) is true if EITHER of its inputs is true. Similarly logical AND ( && operator in C) is true if BOTH of its inputs are true.
yes, it's two nots.
!!a is 1 if a is non-zero and 0 if a is 0
You can think of !! as clamping, as it were, to {0,1}. I personally find the usage a bad attempt to appear fancy.
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