// util.c int globalVar = 10; // main.c #include <stdio.h> extern int globalVar; // Declare the globalVar defined in util.c int main() { printf("The value of globalVar is %d\n", globalVar); return 0; }#include <stdio.h> extern int x = 32; int b = 8; int main() { auto int a = 28; extern int b; printf("The value of auto variable : %d\n", a); printf("The value of extern variables x and b : %d,%d\n",x,b); x = 15; printf("The value of modified extern variable x : %d\n",x); return 0; }