Thread: I don't see the use of ifdef/endif in the following code

Given the following stripped down version of some production code..

Code:

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

#define MIN_LOGIN_LEN 2
#define MAX_LOGIN_LEN 32
int main(void)
{
  char lid[] = "c";

  #ifdef MIN_LOGIN_LEN
  if (strlen(lid) < MIN_LOGIN_LEN)
    {
      fprintf(stderr,"Login name must be at least %d characters long.\n",
              MIN_LOGIN_LEN);
      return 1;
    }
  #endif
    
  if (strlen(lid) > MAX_LOGIN_LEN)
    {
      fprintf(stderr,"Login name exceeds %d characters.\n",MAX_LOGIN_LEN);
      return 1;
    }

 return 0;
}

I get

[cdalten@localhost oakland]$ gcc -g cap3.c -o cap3
[cdalten@localhost oakland]$ ./cap3
Login name must be at least 2 characters long.
[cdalten@localhost oakland]$


Now, when I remove both MIN_LOGIN_LEN and define MAX_LOGIN_LEN in the following..

Code:

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

#define MIN_LOGIN_LEN 2
#define MAX_LOGIN_LEN 32
int main(void)
{
  char lid[] = "c";

  if (strlen(lid) < MIN_LOGIN_LEN)
    {
      fprintf(stderr,"Login name must be at least %d characters long.\n",
              MIN_LOGIN_LEN);
      return 1;
    }
    
  if (strlen(lid) > MAX_LOGIN_LEN)
    {
      fprintf(stderr,"Login name exceeds %d characters.\n",MAX_LOGIN_LEN);
      return 1;
    }

 return 0;
}

[cdalten@localhost oakland]$ gcc -g cap3.c -o cap3
[cdalten@localhost oakland]$ ./cap3
Login name must be at least 2 characters long.

I still get the same results. What is the point of the ifdef/endif in this case.