#define P 3 F(int x){return(P*x*x);} main() {printf("%d\n",F(3+5));} 程序运行后的输出结果是 ( ) #define P 3 void F(int x){return(P*x*x);} main() {printf("%d\n",F(3+5));} 程序运行后的输出结果是 ( )