Calling a static function with global variables in C

Question

I have a static function defined in a c file that uses global static variables of the file. If I call the function from another file and I define the same static global variables but with different values, will it use the values from the original file or from the other file? If not, is there a way to use global parameters in a function I'm calling from different files without receiving them as inputs?

global static variables are file-local... so I guess the answer is "no, it wouldn't", and "no"... and where's the code? — Antti Haapala
– Antti Haapala, Commented May 22, 2017 at 12:04
Furthermore a function with static visibility cannot be called from another file. — Lanting
– Lanting, Commented May 22, 2017 at 12:04
Have a look at this: stackoverflow.com/questions/3684450/… — Bathsheba
– Bathsheba, Commented May 22, 2017 at 12:05
Possible duplicate of How do I use extern to share variables between source files? — Badda
– Badda, Commented May 22, 2017 at 12:05
"global" and "static" is actually the same thing. Do you mean static qualified? — too honest for this site
– too honest for this site, Commented May 22, 2017 at 12:51

jfMR · Accepted Answer · 2017-05-22 12:07:15Z

2

Static variables defined at the outermost level of a source file have file scope, i.e.: they are only visible in that file.

As an example, if you have a source file foo.c:

static int var;

and another one bar.c:

static int var;

There are two different copies of a variable with the name var. Each copy is only visible in the file in which it is defined.

answered May 22, 2017 at 12:07

jfMR

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1 Comment

Jeroen3 Over a year ago

Try to avoid naming like this, name them foo_var and bar_var. You will thank yourself when debugging.

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