int x=2;

void f2()

{

    extern int x;

    printf("In f2 x:%dn",x);

}

void f3()

{

    extern int x;

    printf("In f3 x:%dn",x);

}

#include"stdio.h"
#include"conio.h"
#include"C:TCBINdemo_f1.C"
#include"C:TCBINdemo_f2.C"
#include"C:TCBINdemo_f3.C"
void main()

{

    clrscr();

    printf("In main program,x:%dn",x);

    f2();

    f3();

    getch();

}