queen dew
when i use extern to get a variable 'a' from another file in the same project folder it shows an error: undefined reference to `a'.
can someone explain why is that and what is the solution for it?
int main(int argc, char const *argv[])
{
extern int a;
printf("%d",a);
return 0;
}```
```#include <stdio.h>
int main(int argc, char const *argv[]) {
int a=5;
return 0;
}```
blissful forge
when i use extern to get a variable 'a' from another file in the same project fo...
main.c
#include <stdio.h>
int main(int argc, char **argv) {
extern int a;
printf("%d", a);
return 0;
}
foo.c
int a = 5;
> clang -c foo.c
> clang -c main.c
> clang foo.o main.o -o main.exe
> main.exe
5
I'm fairly certain the definition of int a = 5; for example needs to be in the global scope.
Also your program won't compile with two main functions most likely.
queen dew
main.c
```c
#include <stdio.h>
int main(int argc, char **argv) {
extern int...
i fixed both and still didn't work
queen dew
I was able to compile it.
i use an IDE so i just use the f5 key .
but someone showed me how to compile two files at once and i had to get rid of the parameters that i had in the main function and it worked.
gcc .\main.c -o main.exe .\other.c -Wall -Wextra -Werror -pedantic; .\main.exe