c++ - cpp 中的宏编译错误 (Visual Studio 2012)

Question

#include <iostream>
#define hello()(printf("Hello");)

using namespace std;

void main()
{
hello();
}

我正在使用以下代码，它给出了编译错误！这个程序可能有什么问题！

Answer 1

Parentheses can't be used to enclose statements. What you want is:

#define hello() printf("Hello");

The semicolon is also unnecessary, or maybe you meant:

#define hello() { printf("Hello"); }

Aside from that syntax error, you should probably include cstdio to use printf, and main should return int.