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=============================
Temp_01.c

int aaa = 200;


=============================
Temp.c

static int aaa = 100;

void  main() 

extern int aaa;
printf("the var aaa is : %d\n",aaa);
}

=============================
Temp.c

void  main() 

extern int aaa;
printf("the var aaa is : %d\n",aaa);
}

static int aaa = 100;


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