(#define SQUARE(x)x*x 2#define SQUARE(x)(x)*(x) 3#define SQUARE(x)((x)*(x)) 若a= SQUARE(n+1) 若a=27/ SQUARE(3.0 宏展开 出错|宏展开 ①a=n+1*n+1 ①a=2.713.030出错 ②a=(n+1)*(n+1) ②a=2.7/(3.0)*(3.0) ③a=(n+1)*(n+1) ③a=27/(3,0)*(3① #define SQUARE(x) x*x ② #define SQUARE(x) (x)*(x) ③ #define SQUARE(x) ((x)*(x)) 若 a=2.7/SQUARE(3.0) 宏展开 ① a=2.7/3.0*3.0 ② a=2.7/(3.0)*(3.0) ③ a=2.7/((3.0)*(3.0)) 若 a=SQUARE(n+1) 宏展开 ① a=n+1*n+1 ② a=(n+1)*(n+1) ③ a=((n+1)*(n+1)) 出错 出错