Global Variables

[noridotjabi]

I know that if I want a variable to be global I can define it as such:

....

int var;

int main() {

....

return 0;
}

This way I can access it in all of my functions without passing it as
an argument. I am unsure, however, as to wheater it is possible to do
this with seperate source files. For instance can I have:

/* one */
#include <stdio.h>

int num;

int main() {
chnum();
printf("Num is %d\n", num);
return 0;
}

/* two */
#include <stdio.h>

void chnum() {
num = 7;
return;
}

Is this possible? Thanks in advanced.
Nori

 

[Ian Collins]

I know that if I want a variable to be global I can define it as such:

...

int var;

int main() {

...

return 0;
}

This way I can access it in all of my functions without passing it as
an argument. I am unsure, however, as to wheater it is possible to do
this with seperate source files. For instance can I have:

Declare it extern in a common header, or in the other source files where
you wish to use it.

 

[Keith Thompson]

Declare it extern in a common header, or in the other source files where
you wish to use it.

But first, be very sure that a global variable is the best solution to
your problem. It very likely isn't.