Declaration vs. Definition of a variable in C
main.c
global.c
#include <stdio.h>
#include <stdlib.h>
// Declaration
// - what you need when using the variable
// (name + type)
// Definition
// - what you need when executing the program
// (address + space + Declaration)
extern int x;
int y = 5;
int main(int argc, char* argv[]) {
x = 20;
printf("x = %d\n", x);
printf("y = %d\n", y);
return 0;
}
