Question

Why can’t it be done like this?

    #include<stdio.h>
    #include<stdlib.h>
    struct test
    {
        value z;
        int x;
    };

    main()
    {
        enum value {a,b,c,d};
        struct test come;
        come.z = 2;
        if (a == z) printf("they match ");
        else printf("dont match");
    }

Answer 1

Make the enum a typedef enum and place it above the struct.

#include <stdio.h>
#include <stdlib.h>

typedef enum { a,b,c,d } value;

struct test
{
  value z;
  int x;
};

int main()
{
  struct test come;
  come.z = 2;

  if (a == come.z)
    printf("they match ");
  else
    printf("dont match");
}

Edit: fixed some minor typos.