5 replies to this topic

[AIGuy]

I usually stick to c# or java but i need something a little more low level so I'm trying c. I was wondering, how do you use environment variables like %windir%. I'm using tcc.

[brownhead]

See getenv - C++ Reference

[AIGuy]

this is the code

#include <c:\windows\tcc\include\stdio.h>

#include <c:\windows\tcc\include\stdlib.h>


void main()

{

   printf(getenv("CDir")+"\n");

}

and this is the output

test.c:6: can not use pointers here

any ideas?

[AIGuy]

oh, and CDir = "c:\windows\tcc"

[brownhead]

That is a strange error message, though probably not any stranger than one GCC would give you.

Anywho, you can't concatenate C strings by using the + operator. You need to use a special function. However, since your using printf you can simply say something like this.

printf("%s\n", getenv("CDir"));

Search cplusplus.com (don't be fooled by the name, it documents a lot of C functions as well since C is kind of a subset of C++) for printf to check out the full usage.

[AIGuy]

thanks.