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Since the preprocessor is basically copy- paste. This means that the first call defines "a" as "++x" which means it'll be incremented twice in the first macro. And the second macro is inefficient as it calls cos(x) twice.
Since the preprocessor is basically copy- paste. This means that the first call defines "a" as "++x" which means it'll be incremented twice in the first macro. And the second macro is inefficient as it calls cos(x) twice.