C中宏中括号的必要性
SQR
#define SQR(x) (x*x)int main(){
int a, b=3;
a = SQR(b+5); // Ideally should be replaced with (3+5*5+3), though not sure.
printf("%d\n",a);
return 0;}23SQR(x) ((x)*(x))6423.
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