Question

How to use extern variable to share variables between source files in C

Answer 1

file: test.h

extern int extern_n; // Declaration 

file: test.c

#include "test.h"

extern_n = 100;

file: example.c

#include <stdio.h>

#include "test.h"

int main(int argc, char **argv) 
{ 
    printf("%d", extern_n);
    
    return 0; 
}


/*
  
run:
   
100

*/

 

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