(Each undeclared identifier is reported only once for each f

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(Each undeclared identifier is reported only once for each function it appears in.) 这个怎么改
#include "stdafx.h"
int main()
{
printf("\n");
}
\Users\Administrator\Desktop\qwred\qwred.cpp C:\Users\Admini
5 C:\Users\Administrator\Desktop\qwred\qwred.cpp `printf' undeclared (first use this function) strator\Desktop\qwred\C stdafx.h:No such file or directory.

添加头文件：#include "stdio.h"

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