c - 即使在C中声明后，枚举变量仍显示错误

我试着在c语言中学习枚举，我怀疑枚举变量在我声明之后是否显示错误，但是当我通过函数使用它时，相同的代码仍然可以正常工作？
显示错误的代码：
变量per1和per2显示错误，原因是什么？

enum mar_status
    {
        single = 100, married = 200, divorced = 300, widowed = 400
    };
enum mar_status per1, per2;
per1 = single;
per2 = married

运行良好的代码：

#include<stdio.h>
void global();
int main(){
    global();
    return 0;
}

void global(){
    enum mar_status
        {
            single = 100, married = 200, divorced = 300, widowed = 400
        };
    enum mar_status per1, per2;
    per1 = single;
    per2 = married;
    printf("The person 1 is %d and person 2 is %d\n",per1,per2);
}

感谢帮助我解决问题的人！

最佳答案

C不允许在函数之外使用可执行语句。
前五行是声明，是正确的。
最后两行是可执行语句：

per1 = single;
per2 = married;

必须放在函数中，例如在第二段代码中。
如果要将初始值保留在函数外部，也可以使用初始值进行声明：

enum mar_status {
  single = 100, married = 200, divorced = 300, widowed = 400 };

enum mar_status per1 = single;
enum mar_status per2 = married;

int main(){
  printf("The person 1 is %d and person 2 is %d\n",per1,per2);
  return 0;
}