C++宏定义，错在哪了？？求指点啊 fatal error C1189: #error : "eh.h is only for C++!"

#include #include // 导入这条语句#define S(a,b) a*b // 不用放分号using namespace std;int main(){ int a = 2, b = 3; printf("%d",S(2, 3)); return 0;}