为什么main（）需要花括号？ [英] Why does main() require braces?

问题描述

我在

main() return;

或

main() if();

并获得了不同的错误，最特别的是

and obtained different errors, the most peculiar of which was

/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

虽然一个程序只需要一个语句是不常见的，为什么main（）要求有大括号？

While it's uncommon for a program to require only one statement, why does main() make it a requirement to have braces?

有人可以解释为什么错误所以特别的时候编译只是int main（）;?

Could someone explain why the error was so peculiar when compiling just int main();?

推荐答案

因为你正在定义一个名为 main（）函数定义基本上是一个函数声明（ int main（） part）后跟一个复合语句（ {/ * ... * /} part）（你也可以使用一个函数try块，但是这些很少使用，并且仍然需要大括号）。

Because you are defining a function named main() and a function definition is basically a function declaration (the int main() part) followed by a compound statement (the { /* ... */ } part) (you could also use a function try block, but those are very rarely used and still require braces).

定义任何没有大括号的函数。

You can't define any function without braces.

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