C Macro Question -(x) vs (-x) - Stack Overflow

C Macro Question -(x) vs (-x) - Stack Overflow: "What's abs(1-2)? For parentheses in general, if we define a macro #define sqr(x) x*x, then sqr(1+2) gives the wrong answer because it expands to 1+2*1+2, not (1+2)*(1+2)"

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