是否有可能主后声明的变量具有文件范围是什么？ [英] Is it possible that a variable declared after the main has file scope?

问题描述

运行此code之后：

#include <stdio.h>
int x;
int main(void)
{
    printf("%d\n",x);
    return 0;
}
int x=5; 

我所期望的输出应为 0 。由于在顺序控制结构程序的 INT X; 应先执行 0 打印，最后 INT X = 5; 应该执行。但它给输出 5 。

I expected the output should be 0. Because of the sequence control structure of the program int x; should be executed first and then 0 is printed and finally int x=5; should be executed. But it is giving the output 5.

该计划是如何访问 5 为 X 在的printf ？

How is the program accesses 5 for the x in printf?

推荐答案

第一个充当向前声明，后者作为实际的定义。

The first acts as a forward declaration, and the later acts as the actual definition.

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