Is this a compiler Issue?

This code works:

Code:

---

/*
Compiled under Turbo C 2.01
DO NOT COMPILE WITH WINDOWS
GCC! I haven't tried any
other compilers.
*/

#include <stdio.h> /* For output/input */
#include <stdlib.h> /* For system() */
#include <string.h> /* For strcmp() */
#include <unistd.h> /* For getcwd() */

int main()
{       
        /* The users' command */
        char input[16];

        /* Path variables( getcwd() ) */
        char *ppath; /* Pointer to PATH */
        int ipath; /* Size of PATH */

        /* Special Command Strings */
        char root[3] = "\\\n";
        char quit[6] = "quit\n";
        char ls[4] = "ls\n";

        for(;;)
        {
                getcwd(ppath,ipath); /* Get the current directory */
                printf("%s>",ppath); /* mimic DOS prompt */
                fgets(input,16,stdin); /* Get the input */

                /* Check for "special" commands
                (which are really simple DOS commands)
                If not, then let DOS execute the
                command.*/
                if((strcmp(input,root) == 0) || (strcmp(input,quit) == 0) || (strcmp(input,ls) == 0))
                {
                        if(strcmp(input,root) == 0)
                        {
                                system("cd \\");
                        }
                        if(strcmp(input,quit) == 0)
                        {
                                return 0;
                        }
                        if(strcmp(input,ls) == 0)
                        {
                                system("dir");
                        }

                }
                else
                {
                        system(input);
                }
        }
}

---

But if I add

Code:

---

/* Welcome */
printf("Welcome to DOS/ENHANCE! ");

---

after the start of int main, my compiler gives my expression errors. I'm using Turbo C 2.01. I don't see anything wrong with my new code. Is this just a compiler problem?

Could you post what the errors are? It could be usefull in figuring out what the problem is.

are you doing this?

Code:

---

int main()
{
    printf("Welcome to DOS/ENHANCE! ");
    /* The users' command */
    char input[16];

    /*Path variables( getcwd() ) */
    char *ppath; /* Pointer to PATH */
    int ipath; /* Size of PATH */

    /* Special Command Strings */
    char root[3] = "\\\n";
    char quit[6] = "quit\n";
    char ls[4] = "ls\n";
   
    /* Rest of your code here */

}

---

just going from what you said.. if this is what you did then you got errors because in C you have to declare variable at the start of a function before you can do anything else.

I have to declare ALL variables at the start?
OK. I'll try that.

yes. only C++ will let you declare a variable almost anywhere.

While that is true that its not proper C to declare variables on the fly... most compilers can handel them on the fly. I know that GCC 3.3 under linux can. Also IMHO its bad form to declare variables on the fly.

My compiler doesn't have <unistd.h> but i have the function getcwd() in <dir.h>.

dir.h is a standard library?

I think that dir is specific to DOS. I don't think that unistd.h is even ANSI. But, I'm not the one to know of such things :)

unistd.h : UNIX(R)
dir.h Micro$oft DOS