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error LNK2005: _YPF already defined in bmp.obj

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Èý¸öÎļþ·Ö±ðÊÇmain.c,head.c£¬head.h
C/C++ code:
//head.h
#include <iostream.h>
void a();
int ypf=1;

//main.c
#include "head.h"
int main()
{
ypf=2;
a();
cout<<ypf<<endl;
return 0;
}

//head.c
#include "head.h"
void a()
{
ypf=3;
}


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C/C++ code:

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